diff --git a/nix/mkDevShell.nix b/nix/mkDevShell.nix
index 9f252fbb..07f2d967 100644
--- a/nix/mkDevShell.nix
+++ b/nix/mkDevShell.nix
@@ -14,7 +14,6 @@ let
     root =  pkgs.lib.cleanSource ../.;
     name = "ihaskell";
     returnShellEnv = false;
-    modifier = pkgs.haskell.lib.dontCheck;
     overrides = ihaskellOverlay;
     withHoogle = true;
   };