diff --git a/UnityPy/files/SerializedFile.py b/UnityPy/files/SerializedFile.py
index 314781ab..6177c795 100644
--- a/UnityPy/files/SerializedFile.py
+++ b/UnityPy/files/SerializedFile.py
@@ -673,7 +673,7 @@ def __delitem__(self, key):
         raise NotImplementedError("Deleting from the container is not allowed!")
 
     def __iter__(self):
-        return iter(self.keys)
+        return iter(self.keys())
 
     def __len__(self):
         return len(self.container)