diff --git a/rhodecode/config/routing.py b/rhodecode/config/routing.py
--- a/rhodecode/config/routing.py
+++ b/rhodecode/config/routing.py
@@ -437,8 +437,8 @@ def make_map(config):
                  '/{repo_name:.*}/compare/{org_ref_type}@{org_ref}...{other_ref_type}@{other_ref}',
                  controller='compare', action='index',
                  conditions=dict(function=check_repo),
-                 requirements=dict(org_ref_type='(branch|book|tag)',
-                                   other_ref_type='(branch|book|tag)'))
+                 requirements=dict(org_ref_type='(branch|book|tag|rev)',
+                                   other_ref_type='(branch|book|tag|rev)'))
 
     rmap.connect('pullrequest_home',
                  '/{repo_name:.*}/pull-request/new', controller='pullrequests',