diff --git a/tests/modules/programs/firefox/profiles/overwrite/default.nix b/tests/modules/programs/firefox/profiles/overwrite/default.nix
index 54014bea2ebd..1dcfa35f903f 100644
--- a/tests/modules/programs/firefox/profiles/overwrite/default.nix
+++ b/tests/modules/programs/firefox/profiles/overwrite/default.nix
@@ -39,7 +39,7 @@ in
       nmt.script =
         let
           binPath =
-            if pkgs.hostPlatform.isDarwin then
+            if pkgs.stdenv.hostPlatform.isDarwin then
               "Applications/${cfg.darwinAppName}.app/Contents/MacOS"
             else
               "bin";
diff --git a/tests/modules/programs/firefox/profiles/settings/default.nix b/tests/modules/programs/firefox/profiles/settings/default.nix
index 9aa8af6ac48a..e48fa14f1eda 100644
--- a/tests/modules/programs/firefox/profiles/settings/default.nix
+++ b/tests/modules/programs/firefox/profiles/settings/default.nix
@@ -39,7 +39,7 @@ in
       nmt.script =
         let
           binPath =
-            if pkgs.hostPlatform.isDarwin then
+            if pkgs.stdenv.hostPlatform.isDarwin then
               "Applications/${cfg.darwinAppName}.app/Contents/MacOS"
             else
               "bin";
diff --git a/tests/modules/programs/firefox/profiles/userchrome/default.nix b/tests/modules/programs/firefox/profiles/userchrome/default.nix
index 17ff8ddc8c07..f1b01c642d4b 100644
--- a/tests/modules/programs/firefox/profiles/userchrome/default.nix
+++ b/tests/modules/programs/firefox/profiles/userchrome/default.nix
@@ -37,7 +37,7 @@ in
       nmt.script =
         let
           binPath =
-            if pkgs.hostPlatform.isDarwin then
+            if pkgs.stdenv.hostPlatform.isDarwin then
               "Applications/${cfg.darwinAppName}.app/Contents/MacOS"
             else
               "bin";
diff --git a/tests/modules/programs/firefox/state-version-19_09.nix b/tests/modules/programs/firefox/state-version-19_09.nix
index cabb8c284245..3da8f1374ba0 100644
--- a/tests/modules/programs/firefox/state-version-19_09.nix
+++ b/tests/modules/programs/firefox/state-version-19_09.nix
@@ -13,7 +13,7 @@ in
 {
   imports = [ firefoxMockOverlay ];
 
-  config = lib.mkIf (config.test.enableBig && !pkgs.hostPlatform.isDarwin) (
+  config = lib.mkIf (config.test.enableBig && !pkgs.stdenv.hostPlatform.isDarwin) (
     {
       home.stateVersion = "19.09";
     }