diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index aefa4d2fe484..1514342e245e 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -8830,7 +8830,11 @@ with pkgs;
 
   pagmo2 = callPackage ../development/libraries/pagmo2 { };
 
-  pakcs = callPackage ../development/compilers/pakcs { };
+  pakcs = callPackage ../development/compilers/pakcs {
+    # Doesn't compile with GHC 9.0 due to whitespace syntax changes
+    # see also https://github.com/NixOS/nixpkgs/issues/166108
+    haskellPackages = haskell.packages.ghc8107;
+  };
 
   pal = callPackage ../tools/misc/pal { };