diff --git a/pkgs/top-level/release-haskell.nix b/pkgs/top-level/release-haskell.nix
index 4c44d6624fd3..3a6be7d93fe3 100644
--- a/pkgs/top-level/release-haskell.nix
+++ b/pkgs/top-level/release-haskell.nix
@@ -604,12 +604,8 @@ let
       hashable = released;
       primitive = released;
       semaphore-compat = [
-        # Compiler < 9.8 don't have the semaphore-compat core package
-        compilerNames.ghc865Binary
-        compilerNames.ghc8107
-        compilerNames.ghc902
-        compilerNames.ghc928
-        compilerNames.ghc948
+        # Compiler < 9.8 don't have the semaphore-compat core package, but
+        # requires unix >= 2.8.1.0 which implies GHC >= 9.6 for us.
         compilerNames.ghc966
       ];
       weeder = lib.subtractLists [