diff --git a/ptvp35/__init__.py b/ptvp35/__init__.py
index befc7e1..63d816a 100644
--- a/ptvp35/__init__.py
+++ b/ptvp35/__init__.py
@@ -70,7 +70,7 @@ class KVJson(KVRequest):
         elif isinstance(key, list):
             return tuple(map(cls._load_key, key))
         elif isinstance(key, dict):
-            return tuple((cls._load_key(k), cls._load_key(v)) for k, v in key)
+            return tuple((cls._load_key(k), cls._load_key(v)) for k, v in key.items())
         else:
             raise TypeError("unknown KVJson key type, cannot convert to hashable")