diff --git a/pkgs/development/haskell-modules/configuration-common.nix b/pkgs/development/haskell-modules/configuration-common.nix
index 8ab7e06af2e1..433060b44057 100644
--- a/pkgs/development/haskell-modules/configuration-common.nix
+++ b/pkgs/development/haskell-modules/configuration-common.nix
@@ -212,12 +212,8 @@ self: super: {
   # base bound
   digit = doJailbreak super.digit;
 
-  # 2020-06-05: HACK: does not pass own build suite - `dontCheck` We should
-  # generate optparse-applicative completions for the hnix executable.  Sadly
-  # building of the executable has been disabled for ghc < 8.10 in hnix.
-  # Generating the completions should be activated again, once we default to
-  # ghc 8.10.
-  hnix = dontCheck super.hnix;
+  # 2020-06-05: HACK: does not pass own build suite - `dontCheck`
+  hnix = generateOptparseApplicativeCompletion "hnix" (dontCheck super.hnix);
 
   # https://github.com/haskell-nix/hnix-store/issues/127
   hnix-store-core = addTestToolDepend super.hnix-store-core self.tasty-discover;