diff --git a/flake.nix b/flake.nix
index 7f7e784..770381b 100644
--- a/flake.nix
+++ b/flake.nix
@@ -135,7 +135,7 @@
                                                        }
                                                        print "    ) where"
                                                        for(i=s;i<=e;i++) print "import " mods[i]
-                                                   }' "$_types" > "$sourceRoot/build/Generated/TypesPart${_k}.hs"
+                                                   }' "$_types" > "$sourceRoot/build/Generated/TypesPart''${_k}.hs"
                                                done
 
                                                # Empty stub: Generated.Types is NOT a re-export hub.