diff --git a/modules/services/blueman-applet.nix b/modules/services/blueman-applet.nix
index 460dd1677c5d..d81db1dbb58f 100644
--- a/modules/services/blueman-applet.nix
+++ b/modules/services/blueman-applet.nix
@@ -21,6 +21,11 @@ with lib;
   };
 
   config = mkIf config.services.blueman-applet.enable {
+    assertions = [
+      (hm.assertions.assertPlatform "services.blueman-applet" pkgs
+        platforms.linux)
+    ];
+
     systemd.user.services.blueman-applet = {
       Unit = {
         Description = "Blueman applet";
diff --git a/modules/services/dunst.nix b/modules/services/dunst.nix
index b98b645e42ae..8606e24813bc 100644
--- a/modules/services/dunst.nix
+++ b/modules/services/dunst.nix
@@ -130,6 +130,10 @@ in {
 
   config = mkIf cfg.enable (mkMerge [
     {
+      assertions = [
+        (hm.assertions.assertPlatform "services.dunst" pkgs platforms.linux)
+      ];
+
       home.packages = [ cfg.package ];
 
       xdg.dataFile."dbus-1/services/org.knopwob.dunst.service".source =
diff --git a/modules/services/gpg-agent.nix b/modules/services/gpg-agent.nix
index fb59d70924cf..39e93669fb49 100644
--- a/modules/services/gpg-agent.nix
+++ b/modules/services/gpg-agent.nix
@@ -263,6 +263,10 @@ in {
     #
     # directory.
     {
+      assertions = [
+        (hm.assertions.assertPlatform "services.gpg-agent" pkgs platforms.linux)
+      ];
+
       systemd.user.services.gpg-agent = {
         Unit = {
           Description = "GnuPG cryptographic agent and passphrase cache";
diff --git a/modules/services/kdeconnect.nix b/modules/services/kdeconnect.nix
index 87c57c4e9b6b..0c6aac31e80f 100644
--- a/modules/services/kdeconnect.nix
+++ b/modules/services/kdeconnect.nix
@@ -27,6 +27,11 @@ in {
     (mkIf cfg.enable {
       home.packages = [ package ];
 
+      assertions = [
+        (hm.assertions.assertPlatform "services.kdeconnect" pkgs
+          platforms.linux)
+      ];
+
       systemd.user.services.kdeconnect = {
         Unit = {
           Description =
@@ -46,6 +51,11 @@ in {
     })
 
     (mkIf cfg.indicator {
+      assertions = [
+        (hm.assertions.assertPlatform "services.kdeconnect" pkgs
+          platforms.linux)
+      ];
+
       systemd.user.services.kdeconnect-indicator = {
         Unit = {
           Description = "kdeconnect-indicator";
diff --git a/modules/services/keepassx.nix b/modules/services/keepassx.nix
index dc37066e20ce..7f85823619d8 100644
--- a/modules/services/keepassx.nix
+++ b/modules/services/keepassx.nix
@@ -12,6 +12,10 @@ with lib;
   };
 
   config = mkIf config.services.keepassx.enable {
+    assertions = [
+      (hm.assertions.assertPlatform "services.keepassx" pkgs platforms.linux)
+    ];
+
     systemd.user.services.keepassx = {
       Unit = {
         Description = "KeePassX password manager";
diff --git a/modules/services/mpd-discord-rpc.nix b/modules/services/mpd-discord-rpc.nix
index 5e7a6664b8a8..50bc824b095b 100644
--- a/modules/services/mpd-discord-rpc.nix
+++ b/modules/services/mpd-discord-rpc.nix
@@ -39,6 +39,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (hm.assertions.assertPlatform "services.mpd-discord-rpc" pkgs
+        platforms.linux)
+    ];
+
     xdg.configFile."discord-rpc/config.toml".source = configFile;
 
     systemd.user.services.mpd-discord-rpc = {
diff --git a/modules/services/owncloud-client.nix b/modules/services/owncloud-client.nix
index d55d8ffa2a41..4eeafcf0a74c 100644
--- a/modules/services/owncloud-client.nix
+++ b/modules/services/owncloud-client.nix
@@ -8,6 +8,11 @@ with lib;
   };
 
   config = mkIf config.services.owncloud-client.enable {
+    assertions = [
+      (hm.assertions.assertPlatform "services.owncloud-client" pkgs
+        platforms.linux)
+    ];
+
     systemd.user.services.owncloud-client = {
       Unit = {
         Description = "Owncloud Client";
diff --git a/modules/services/pasystray.nix b/modules/services/pasystray.nix
index 15c951e137ef..32922ad0fac3 100644
--- a/modules/services/pasystray.nix
+++ b/modules/services/pasystray.nix
@@ -10,6 +10,10 @@ with lib;
   };
 
   config = mkIf config.services.pasystray.enable {
+    assertions = [
+      (hm.assertions.assertPlatform "services.pasystray" pkgs platforms.linux)
+    ];
+
     systemd.user.services.pasystray = {
       Unit = {
         Description = "PulseAudio system tray";
diff --git a/modules/services/picom.nix b/modules/services/picom.nix
index f4f8edb4301a..66f707c0a13c 100644
--- a/modules/services/picom.nix
+++ b/modules/services/picom.nix
@@ -270,6 +270,11 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.picom" pkgs
+        lib.platforms.linux)
+    ];
+
     services.picom.settings = mkDefaultAttrs {
       # fading
       fading = cfg.fade;
diff --git a/modules/services/random-background.nix b/modules/services/random-background.nix
index 9deee8deb5c1..16c869a9c52d 100644
--- a/modules/services/random-background.nix
+++ b/modules/services/random-background.nix
@@ -68,6 +68,11 @@ in {
 
   config = mkIf cfg.enable (mkMerge ([
     {
+      assertions = [
+        (hm.assertions.assertPlatform "services.random-background" pkgs
+          platforms.linux)
+      ];
+
       systemd.user.services.random-background = {
         Unit = {
           Description = "Set random desktop background using feh";
diff --git a/modules/services/stalonetray.nix b/modules/services/stalonetray.nix
index 93fff3e7b5fe..172d6dd9dcf6 100644
--- a/modules/services/stalonetray.nix
+++ b/modules/services/stalonetray.nix
@@ -51,6 +51,11 @@ in {
 
   config = mkIf cfg.enable (mkMerge [
     {
+      assertions = [
+        (hm.assertions.assertPlatform "services.stalonetray" pkgs
+          platforms.linux)
+      ];
+
       home.packages = [ cfg.package ];
 
       systemd.user.services.stalonetray = {
diff --git a/modules/services/swayidle.nix b/modules/services/swayidle.nix
index db54f9e27f79..6e8b55cb830d 100644
--- a/modules/services/swayidle.nix
+++ b/modules/services/swayidle.nix
@@ -108,6 +108,10 @@ in {
   };
 
   config = mkIf cfg.enable {
+    assertions = [
+      (hm.assertions.assertPlatform "services.swayidle" pkgs platforms.linux)
+    ];
+
     systemd.user.services.swayidle = {
       Unit = {
         Description = "Idle manager for Wayland";
diff --git a/modules/services/syncthing.nix b/modules/services/syncthing.nix
index 2f9cecdb4f9b..bbe9f86609ae 100644
--- a/modules/services/syncthing.nix
+++ b/modules/services/syncthing.nix
@@ -98,6 +98,11 @@ in {
     })
 
     (mkIf (isAttrs cfg.tray && cfg.tray.enable) {
+      assertions = [
+        (hm.assertions.assertPlatform "services.syncthing.tray" pkgs
+          platforms.linux)
+      ];
+
       systemd.user.services = {
         ${cfg.tray.package.pname} = {
           Unit = {
@@ -118,6 +123,11 @@ in {
 
     # deprecated
     (mkIf (isBool cfg.tray && cfg.tray) {
+      assertions = [
+        (hm.assertions.assertPlatform "services.syncthing.tray" pkgs
+          platforms.linux)
+      ];
+
       systemd.user.services = {
         "syncthingtray" = {
           Unit = {
diff --git a/modules/services/taffybar.nix b/modules/services/taffybar.nix
index 088827b9554a..42ca5f7bb785 100644
--- a/modules/services/taffybar.nix
+++ b/modules/services/taffybar.nix
@@ -24,6 +24,10 @@ in {
   };
 
   config = mkIf config.services.taffybar.enable {
+    assertions = [
+      (hm.assertions.assertPlatform "services.taffybar" pkgs platforms.linux)
+    ];
+
     systemd.user.services.taffybar = {
       Unit = {
         Description = "Taffybar desktop bar";
diff --git a/modules/services/tahoe-lafs.nix b/modules/services/tahoe-lafs.nix
index 742b779b270f..105ef3d03b28 100644
--- a/modules/services/tahoe-lafs.nix
+++ b/modules/services/tahoe-lafs.nix
@@ -10,6 +10,10 @@ with lib;
   };
 
   config = mkIf config.services.tahoe-lafs.enable {
+    assertions = [
+      (hm.assertions.assertPlatform "services.tahoe-lafs" pkgs platforms.linux)
+    ];
+
     systemd.user.services.tahoe-lafs = {
       Unit = { Description = "Tahoe-LAFS"; };
 
diff --git a/modules/services/udiskie.nix b/modules/services/udiskie.nix
index d53d7cc8ab54..562297963d0b 100644
--- a/modules/services/udiskie.nix
+++ b/modules/services/udiskie.nix
@@ -98,6 +98,10 @@ in {
   };
 
   config = mkIf config.services.udiskie.enable {
+    assertions = [
+      (hm.assertions.assertPlatform "services.udiskie" pkgs platforms.linux)
+    ];
+
     xdg.configFile."udiskie/config.yml".source =
       yaml.generate "udiskie-config.yml" (mergeSets [
         {
diff --git a/modules/systemd.nix b/modules/systemd.nix
index e4c36ae42051..456b22fd1640 100644
--- a/modules/systemd.nix
+++ b/modules/systemd.nix
@@ -10,16 +10,6 @@ let
   mkPathSafeName =
     lib.replaceStrings [ "@" ":" "\\" "[" "]" ] [ "-" "-" "-" "" "" ];
 
-  enabled = cfg.services != { } # \
-    || cfg.slices != { } # \
-    || cfg.sockets != { } # \
-    || cfg.targets != { } # \
-    || cfg.timers != { } # \
-    || cfg.paths != { } # \
-    || cfg.mounts != { } # \
-    || cfg.automounts != { } # \
-    || cfg.sessionVariables != { };
-
   toSystemdIni = lib.generators.toINI {
     listsAsDuplicateKeys = true;
     mkKeyValue = key: value:
@@ -239,92 +229,72 @@ in {
     };
   };
 
-  config = mkMerge [
-    {
-      assertions = [{
-        assertion = enabled -> pkgs.stdenv.isLinux;
-        message = let
-          names = lib.concatStringsSep ", " (lib.attrNames ( # \
-            cfg.services # \
-            // cfg.slices # \
-            // cfg.sockets # \
-            // cfg.targets # \
-            // cfg.timers # \
-            // cfg.paths # \
-            // cfg.mounts # \
-            // cfg.sessionVariables));
-        in "Must use Linux for modules that require systemd: " + names;
-      }];
-    }
-
-    # If we run under a Linux system we assume that systemd is
-    # available, in particular we assume that systemctl is in PATH.
-    # Do not install any user services if username is root.
-    (mkIf (pkgs.stdenv.isLinux && config.home.username != "root") {
-      xdg.configFile = mkMerge [
-        (lib.listToAttrs ((buildServices "service" cfg.services)
-          ++ (buildServices "slice" cfg.slices)
-          ++ (buildServices "socket" cfg.sockets)
-          ++ (buildServices "target" cfg.targets)
-          ++ (buildServices "timer" cfg.timers)
-          ++ (buildServices "path" cfg.paths)
-          ++ (buildServices "mount" cfg.mounts)
-          ++ (buildServices "automount" cfg.automounts)))
-
-        sessionVariables
-      ];
-
-      # Run systemd service reload if user is logged in. If we're
-      # running this from the NixOS module then XDG_RUNTIME_DIR is not
-      # set and systemd commands will fail. We'll therefore have to
-      # set it ourselves in that case.
-      home.activation.reloadSystemd = hm.dag.entryAfter [ "linkGeneration" ]
-        (let
-          cmd = {
-            suggest = ''
-              PATH=${dirOf cfg.systemctlPath}:$PATH \
-              bash ${./systemd-activate.sh} "''${oldGenPath=}" "$newGenPath"
-            '';
-            legacy = ''
-              PATH=${dirOf cfg.systemctlPath}:$PATH \
-              ${pkgs.ruby}/bin/ruby ${./systemd-activate.rb} \
-                "''${oldGenPath=}" "$newGenPath" "${servicesStartTimeoutMs}"
-            '';
-            sd-switch = let
-              timeoutArg = if cfg.servicesStartTimeoutMs != 0 then
-                "--timeout " + servicesStartTimeoutMs
-              else
-                "";
-            in ''
-              ${pkgs.sd-switch}/bin/sd-switch \
-                ''${DRY_RUN:+--dry-run} $VERBOSE_ARG ${timeoutArg} \
-                ''${oldGenPath:+--old-units $oldGenPath/home-files/.config/systemd/user} \
-                --new-units $newGenPath/home-files/.config/systemd/user
-            '';
-          };
+  # If we run under a Linux system we assume that systemd is
+  # available, in particular we assume that systemctl is in PATH.
+  # Do not install any user services if username is root.
+  config = mkIf (pkgs.stdenv.isLinux && config.home.username != "root") {
+    xdg.configFile = mkMerge [
+      (lib.listToAttrs ((buildServices "service" cfg.services)
+        ++ (buildServices "slice" cfg.slices)
+        ++ (buildServices "socket" cfg.sockets)
+        ++ (buildServices "target" cfg.targets)
+        ++ (buildServices "timer" cfg.timers)
+        ++ (buildServices "path" cfg.paths)
+        ++ (buildServices "mount" cfg.mounts)
+        ++ (buildServices "automount" cfg.automounts)))
+
+      sessionVariables
+    ];
+
+    # Run systemd service reload if user is logged in. If we're
+    # running this from the NixOS module then XDG_RUNTIME_DIR is not
+    # set and systemd commands will fail. We'll therefore have to
+    # set it ourselves in that case.
+    home.activation.reloadSystemd = hm.dag.entryAfter [ "linkGeneration" ] (let
+      cmd = {
+        suggest = ''
+          PATH=${dirOf cfg.systemctlPath}:$PATH \
+          bash ${./systemd-activate.sh} "''${oldGenPath=}" "$newGenPath"
+        '';
+        legacy = ''
+          PATH=${dirOf cfg.systemctlPath}:$PATH \
+          ${pkgs.ruby}/bin/ruby ${./systemd-activate.rb} \
+            "''${oldGenPath=}" "$newGenPath" "${servicesStartTimeoutMs}"
+        '';
+        sd-switch = let
+          timeoutArg = if cfg.servicesStartTimeoutMs != 0 then
+            "--timeout " + servicesStartTimeoutMs
+          else
+            "";
+        in ''
+          ${pkgs.sd-switch}/bin/sd-switch \
+            ''${DRY_RUN:+--dry-run} $VERBOSE_ARG ${timeoutArg} \
+            ''${oldGenPath:+--old-units $oldGenPath/home-files/.config/systemd/user} \
+            --new-units $newGenPath/home-files/.config/systemd/user
+        '';
+      };
 
-          ensureRuntimeDir =
-            "XDG_RUNTIME_DIR=\${XDG_RUNTIME_DIR:-/run/user/$(id -u)}";
+      ensureRuntimeDir =
+        "XDG_RUNTIME_DIR=\${XDG_RUNTIME_DIR:-/run/user/$(id -u)}";
 
-          systemctl = "${ensureRuntimeDir} ${cfg.systemctlPath}";
-        in ''
-          systemdStatus=$(${systemctl} --user is-system-running 2>&1 || true)
+      systemctl = "${ensureRuntimeDir} ${cfg.systemctlPath}";
+    in ''
+      systemdStatus=$(${systemctl} --user is-system-running 2>&1 || true)
 
-          if [[ $systemdStatus == 'running' || $systemdStatus == 'degraded' ]]; then
-            if [[ $systemdStatus == 'degraded' ]]; then
-              warnEcho "The user systemd session is degraded:"
-              ${systemctl} --user --no-pager --state=failed
-              warnEcho "Attempting to reload services anyway..."
-            fi
+      if [[ $systemdStatus == 'running' || $systemdStatus == 'degraded' ]]; then
+        if [[ $systemdStatus == 'degraded' ]]; then
+          warnEcho "The user systemd session is degraded:"
+          ${systemctl} --user --no-pager --state=failed
+          warnEcho "Attempting to reload services anyway..."
+        fi
 
-            ${ensureRuntimeDir} \
-              ${getAttr cfg.startServices cmd}
-          else
-            echo "User systemd daemon not running. Skipping reload."
-          fi
+        ${ensureRuntimeDir} \
+          ${getAttr cfg.startServices cmd}
+      else
+        echo "User systemd daemon not running. Skipping reload."
+      fi
 
-          unset systemdStatus
-        '');
-    })
-  ];
+      unset systemdStatus
+    '');
+  };
 }