diff --git a/django/db/models/query.py b/django/db/models/query.py
index 12b2ff9d318..e01905551e2 100644
--- a/django/db/models/query.py
+++ b/django/db/models/query.py
@@ -109,6 +109,8 @@ class QuerySet(object):
 
     def __getitem__(self, k):
         "Retrieve an item or slice from the set of results."
+        if not isinstance(k, (slice, int)):
+            raise TypeError
         assert (not isinstance(k, slice) and (k >= 0)) \
             or (isinstance(k, slice) and (k.start is None or k.start >= 0) and (k.stop is None or k.stop >= 0)), \
             "Negative indexing is not supported."