diff --git a/kallithea/controllers/pullrequests.py b/kallithea/controllers/pullrequests.py
--- a/kallithea/controllers/pullrequests.py
+++ b/kallithea/controllers/pullrequests.py
@@ -609,7 +609,7 @@ class PullrequestsController(BaseRepoCon
                                                            other_scm_instance.path)
                     else:
                         hgrepo = org_scm_instance._repo
-                    show = set(hgrepo.revs('::%ld & !::%s & !::%s',
+                    show = set(hgrepo.revs('::%ld & !::parents(%s) & !::%s',
                                            avail_revs, revs[0], targethead))
                     c.update_msg = _('This pull request can be updated with changes on %s:') % c.cs_branch_name
                 else:
diff --git a/kallithea/templates/pullrequests/pullrequest_show.html b/kallithea/templates/pullrequests/pullrequest_show.html
--- a/kallithea/templates/pullrequests/pullrequest_show.html
+++ b/kallithea/templates/pullrequests/pullrequest_show.html
@@ -185,7 +185,7 @@ ${self.repo_context_bar('showpullrequest
                       %if cs.revision == c.cs_ranges[-1].revision:
                         <td>
                           %if editable:
-                            ${h.radio(name='updaterev', value='')}
+                            ${h.radio(name='updaterev', value='', checked=True)}
                           %endif
                         </td>
                         <td colspan="2">${_("Current revision - no change")}</td>