diff --git a/pkgs/development/haskell-modules/configuration-ghc-7.10.x.nix b/pkgs/development/haskell-modules/configuration-ghc-7.10.x.nix
index 4dfb4ab96b9..1f975c44b91 100644
--- a/pkgs/development/haskell-modules/configuration-ghc-7.10.x.nix
+++ b/pkgs/development/haskell-modules/configuration-ghc-7.10.x.nix
@@ -82,4 +82,7 @@ self: super: {
   # https://github.com/ndmitchell/extra/issues/4
   extra = dontCheck super.extra;
 
+  # Test suite fails in "/tokens_bytestring_unicode.g.bin".
+  alex = dontCheck super.alex;
+
 }