diff --git a/pkgs/development/haskell-modules/configuration-ghc-7.4.x.nix b/pkgs/development/haskell-modules/configuration-ghc-7.4.x.nix
index a00b89e5b4e..5d080b1b4eb 100644
--- a/pkgs/development/haskell-modules/configuration-ghc-7.4.x.nix
+++ b/pkgs/development/haskell-modules/configuration-ghc-7.4.x.nix
@@ -70,4 +70,7 @@ self: super: {
   # Needs hashable on pre 7.10.x compilers.
   nats = addBuildDepend super.nats self.hashable;
 
+  # Test suite won't compile.
+  unix-time = dontCheck super.unix-time;
+
 }