diff --git a/kallithea/controllers/pullrequests.py b/kallithea/controllers/pullrequests.py
--- a/kallithea/controllers/pullrequests.py
+++ b/kallithea/controllers/pullrequests.py
@@ -328,9 +328,8 @@ class PullrequestsController(BaseRepoCon
          org_ref_name,
          org_rev) = org_ref.split(':')
         if org_ref_type == 'rev':
-            org_ref_type = 'branch'
             cs = org_repo.scm_instance.get_changeset(org_rev)
-            org_ref = '%s:%s:%s' % (org_ref_type, cs.branch, cs.raw_id)
+            org_ref = 'branch:%s:%s' % (cs.branch, cs.raw_id)
 
         other_repo_name = _form['other_repo']
         other_ref = _form['other_ref'] # will have symbolic name and head revision