diff --git a/flakeModule.nix b/flakeModule.nix
index e56d25c..a408955 100644
--- a/flakeModule.nix
+++ b/flakeModule.nix
@@ -89,7 +89,7 @@
             default = null;
           };
           rules = mkOption {
-            type = types.nullOr types.attrs;
+            type = types.nullOr (types.listOf types.attrs);
             default = null;
           };
         };