diff --git a/pkgs/lazyUtils.nix b/pkgs/lazyUtils.nix
index 5e3a1dd..56cba90 100644
--- a/pkgs/lazyUtils.nix
+++ b/pkgs/lazyUtils.nix
@@ -30,7 +30,11 @@ let
         baseNameOf plugin.short
       else if (plugin ? dir && plugin.dir != null) then
         (
-          assert ((builtins.isString plugin.dir) || (lib.isDerivation plugin.dir));
+          assert builtins.any (isType: isType plugin.dir) [
+            lib.isDerivation
+            builtins.isString
+            builtins.isPath
+          ];
           if (lib.isDerivation plugin.dir) then plugin.dir.pname else (baseNameOf plugin.dir)
         )
       else