diff --git a/pkgs/development/haskell-modules/configuration-ghc-8.10.x.nix b/pkgs/development/haskell-modules/configuration-ghc-8.10.x.nix
index 69f212dad9af9..6be0c3c9b1a14 100644
--- a/pkgs/development/haskell-modules/configuration-ghc-8.10.x.nix
+++ b/pkgs/development/haskell-modules/configuration-ghc-8.10.x.nix
@@ -111,6 +111,10 @@ self: super: {
   });
 
   # hnix 0.9.0 does not provide an executable for ghc < 8.10, so define completions here for now.
-  hnix = generateOptparseApplicativeCompletion "hnix" super.hnix;
+  hnix = generateOptparseApplicativeCompletion "hnix"
+    (overrideCabal super.hnix (drv: {
+      # executable is allowed for ghc >= 8.10 and needs repline
+      executableHaskellDepends = drv.executableToolDepends or [] ++ [ self.repline ];
+    }));
 
 }