diff --git a/nix/overlays/haskell-packages.nix b/nix/overlays/haskell-packages.nix
index 8f79fc3..40c0ca5 100644
--- a/nix/overlays/haskell-packages.nix
+++ b/nix/overlays/haskell-packages.nix
@@ -12,12 +12,9 @@ let
 
   pkgs = self;
 
-  WError =
-    drv: appendConfigureFlag drv "--ghc-option=-Werror";
-
   configurations =
     self: super: {
-      rel8 = addBuildTool (WError (callCabal2nix "rel8" (builtins.path { path = ../../.; name = "rel8"; }) {})) pkgs.postgresql;
+      rel8 = addBuildTool (callCabal2nix "rel8" (builtins.path { path = ../../.; name = "rel8"; }) {}) pkgs.postgresql;
     };
 
 in