diff --git a/flake.nix b/flake.nix
index 813a6e9..5543231 100644
--- a/flake.nix
+++ b/flake.nix
@@ -125,7 +125,7 @@
                                                "--ghc-option=-O0"
                                                "--ghc-option=-fomit-interface-pragmas"
                                                "--disable-split-sections"
-                                               "--ghc-option=-fno-dynamic-too"
+                                               "--ghc-option=-j1"
                                            ];
                                            postUnpack = (old.postUnpack or "") + ''
                                                _actual="$sourceRoot/build/Generated/ActualTypes.hs"