diff --git a/django/utils/encoding.py b/django/utils/encoding.py
index 2319496538..69c3e9c28b 100644
--- a/django/utils/encoding.py
+++ b/django/utils/encoding.py
@@ -30,7 +30,7 @@ def force_unicode(s, encoding='utf-8', strings_only=False, errors='strict'):
 
     If strings_only is True, don't convert (some) non-string-like objects.
     """
-    if strings_only and isinstance(s, (types.NoneType, int)):
+    if strings_only and isinstance(s, (types.NoneType, int, long)):
         return s
     if not isinstance(s, basestring,):
         if hasattr(s, '__unicode__'):