diff --git a/oml/cache.py b/oml/cache.py
index 22b0471..a56d299 100644
--- a/oml/cache.py
+++ b/oml/cache.py
@@ -8,10 +8,10 @@ class Cache(dict):
 
     def get(self, key):
         now = time.time()
-        for key, value in list(self._added.items()):
+        for k, value in list(self._added.items()):
             if value < now:
-                del self._added[key]
-                del self[key]
+                del self._added[k]
+                del self[k]
         return dict.get(self, key)
 
     def set(self, key, value, ttl=None):