diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index f34386fa180..f77199bd8af 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -1771,7 +1771,9 @@ let result = let callPackage = x : y : modifyPrio (newScope result.finalReturn x
 
   ppm = callPackage ../development/libraries/haskell/ppm {};
 
-  prettyShow = callPackage ../development/libraries/haskell/pretty-show {};
+  prettyShow = callPackage ../development/libraries/haskell/pretty-show {
+    happy = self.happy_1_19_2;
+  };
 
   punycode = callPackage ../development/libraries/haskell/punycode {};