diff --git a/pkgs/development/haskell-modules/with-packages-wrapper.nix b/pkgs/development/haskell-modules/with-packages-wrapper.nix
index c478c875540d..94cee5c0c6d7 100644
--- a/pkgs/development/haskell-modules/with-packages-wrapper.nix
+++ b/pkgs/development/haskell-modules/with-packages-wrapper.nix
@@ -161,8 +161,8 @@ symlinkJoin {
     ''}
     $out/bin/${ghcCommand}-pkg check
   '' + postBuild;
+  preferLocalBuild = true;
   passthru = {
-    preferLocalBuild = true;
     inherit (ghc) version meta;
 
     # Inform users about backwards incompatibilities with <= 21.05