diff --git a/pkgs/development/haskell-modules/configuration-common.nix b/pkgs/development/haskell-modules/configuration-common.nix
index d566e4f66f9d7..e0d9ade4a2721 100644
--- a/pkgs/development/haskell-modules/configuration-common.nix
+++ b/pkgs/development/haskell-modules/configuration-common.nix
@@ -1740,6 +1740,21 @@ with haskellLib;
     (appendPatches [ ./patches/pattern-arrows-add-fix-import.patch ])
   ];
 
+  # posix-waitpid - Fix CPid constructor import and version bounds
+  # Broken since 2011 (GHC 7.4+), marked broken in nixpkgs since 2016
+  # The original package has no repo however there's a fork with the
+  # fix at https://github.com/GaloisInc/posix-waitpid
+  posix-waitpid = lib.pipe super.posix-waitpid [
+    (overrideCabal (drv: {
+      postPatch = ''
+        substituteInPlace System/Posix/Waitpid.hs \
+          --replace 'import System.Posix.Types (CPid)' \
+                    'import System.Posix.Types (CPid(..))'
+      '';
+    }))
+    doJailbreak
+  ];
+
   # 2024-03-19: Fix for mtl >= 2.3
   cheapskate = lib.pipe super.cheapskate [
     doJailbreak
diff --git a/pkgs/development/haskell-modules/configuration-hackage2nix/broken.yaml b/pkgs/development/haskell-modules/configuration-hackage2nix/broken.yaml
index 4561394deeca7..966a7509a715e 100644
--- a/pkgs/development/haskell-modules/configuration-hackage2nix/broken.yaml
+++ b/pkgs/development/haskell-modules/configuration-hackage2nix/broken.yaml
@@ -4934,7 +4934,6 @@ broken-packages:
   - posix-acl # failure in job https://hydra.nixos.org/build/233222892 at 2023-09-02
   - posix-filelock # failure in job https://hydra.nixos.org/build/252726822 at 2024-03-16
   - posix-realtime # failure in job https://hydra.nixos.org/build/233191463 at 2023-09-02
-  - posix-waitpid # failure in job https://hydra.nixos.org/build/233206551 at 2023-09-02
   - postcodes # failure in job https://hydra.nixos.org/build/233247290 at 2023-09-02
   - postgis-trivial # failure in job https://hydra.nixos.org/build/295096168 at 2025-04-22
   - postgres-embedded # failure in job https://hydra.nixos.org/build/233246098 at 2023-09-02
diff --git a/pkgs/development/haskell-modules/hackage-packages.nix b/pkgs/development/haskell-modules/hackage-packages.nix
index 4c4a4078e2c0b..99b233b58c3e3 100644
--- a/pkgs/development/haskell-modules/hackage-packages.nix
+++ b/pkgs/development/haskell-modules/hackage-packages.nix
@@ -536784,8 +536784,6 @@ self: {
       ];
       description = "Low-level wrapping of POSIX waitpid(2)";
       license = lib.licenses.mit;
-      hydraPlatforms = lib.platforms.none;
-      broken = true;
     }
   ) { };