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--- a/bottle.py
+++ b/bottle.py
@@ -1422,7 +1422,7 @@
             if key == 'expires':
                 if isinstance(value, (datedate, datetime)):
                     value = value.timetuple()
-                elif isinstance(value, (int, float)):
+                elif isinstance(value, (int, long, float)):
                     value = time.gmtime(value)
                 value = time.strftime("%a, %d %b %Y %H:%M:%S GMT", value)
             self._cookies[name][key.replace('_', '-')] = value