diff --git a/zengine/lib/test_utils.py b/zengine/lib/test_utils.py
index d9a6a858..f0e0704e 100644
--- a/zengine/lib/test_utils.py
+++ b/zengine/lib/test_utils.py
@@ -94,7 +94,7 @@ def set_path(self, path, token=''):
         self.path = path
         self.token = token
 
-    def _prepare_post(self, **data):
+    def _prepare_post(self, data):
         """
         by default data dict encoded as json and
         content type set as application/json