diff --git a/pkg.nix b/pkg.nix
index 98a7266..0ce4098 100644
--- a/pkg.nix
+++ b/pkg.nix
@@ -14,7 +14,9 @@
 mkDerivation {
   pname = "yammat";
   version = "0.0.8";
-  src = ./.;
+  src = builtins.filterSource (
+    path: type: builtins.match ".*\.nix" path == null
+  ) ./.;
   isLibrary = true;
   isExecutable = true;
   libraryHaskellDepends = [