diff --git a/pkgs/development/haskell-modules/configuration-ghc-8.0.x.nix b/pkgs/development/haskell-modules/configuration-ghc-8.0.x.nix
index cc5034008bb6..dd544a769724 100644
--- a/pkgs/development/haskell-modules/configuration-ghc-8.0.x.nix
+++ b/pkgs/development/haskell-modules/configuration-ghc-8.0.x.nix
@@ -51,4 +51,7 @@ self: super: {
   # https://github.com/hspec/HUnit/issues/7
   HUnit = dontCheck super.HUnit;
 
+  # Older versions don't support our version of base.
+  async = self.async_2_1_0;
+
 }