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--- a/ForgeTracker/forgetracker/model/issue.py
+++ b/ForgeTracker/forgetracker/model/issue.py
@@ -69,7 +69,7 @@
     attachments = RelationProperty('Attachment')
 
     def url(self):
-        return c.app.script_name + '/' + self.issue_num + '/'
+        return c.app.script_name + '/' + str(self.issue_num) + '/'
 
     def shorthand_id(self):
         return '%s/%s' % (self.type_s, self.issue_num)