diff --git a/kallithea/public/js/base.js b/kallithea/public/js/base.js
--- a/kallithea/public/js/base.js
+++ b/kallithea/public/js/base.js
@@ -731,7 +731,7 @@ var injectInlineForm = function(tr){
         // callbacks
         tooltip_activate();
         MentionsAutoComplete('text_'+lineno, 'mentions_container_'+lineno,
-                             _USERS_AC_DATA, _GROUPS_AC_DATA);
+                             _USERS_AC_DATA);
         $('#text_'+lineno).focus();
     },10)
 };
@@ -1289,9 +1289,8 @@ var _MembersAutoComplete = function (div
     };
 }
 
-var MentionsAutoComplete = function (divid, cont, users_list, groups_list) {
+var MentionsAutoComplete = function (divid, cont, users_list) {
     var myUsers = users_list;
-    var myGroups = groups_list;
 
     // Define a custom search function for the DataSource of users
     var matchUsers = function (sQuery) {
@@ -1318,11 +1317,6 @@ var MentionsAutoComplete = function (div
             return matches
         };
 
-    //match all
-    var matchAll = function (sQuery) {
-            return matchUsers(sQuery);
-        };
-
     // DataScheme for owner
     var ownerDS = new YAHOO.util.FunctionDataSource(matchUsers);
 
@@ -1515,10 +1509,9 @@ var removeReviewMember = function(review
     $li.find('.reviewer_member_remove').replaceWith(' (remove not saved)');
 }
 
-/* activate auto completion of users and groups ... but only used for users as PR reviewers */
-var PullRequestAutoComplete = function (divid, cont, users_list, groups_list) {
+/* activate auto completion of users as PR reviewers */
+var PullRequestAutoComplete = function (divid, cont, users_list) {
     var myUsers = users_list;
-    var myGroups = groups_list;
 
     // Define a custom search function for the DataSource of users
     var matchUsers = function (sQuery) {
@@ -1540,29 +1533,6 @@ var PullRequestAutoComplete = function (
             return matches;
         };
 
-    // Define a custom search function for the DataSource of userGroups
-    var matchGroups = function (sQuery) {
-            // Case insensitive matching
-            var query = sQuery.toLowerCase();
-            var i = 0;
-            var l = myGroups.length;
-            var matches = [];
-
-            // Match against each name of each contact
-            for (; i < l; i++) {
-                matched_group = myGroups[i];
-                if (matched_group.grname.toLowerCase().indexOf(query) > -1) {
-                    matches[matches.length] = matched_group;
-                }
-            }
-            return matches;
-        };
-
-    //match all
-    var matchAll = function (sQuery) {
-            return matchUsers(sQuery);
-        };
-
     // DataScheme for owner
     var ownerDS = new YAHOO.util.FunctionDataSource(matchUsers);
 
diff --git a/kallithea/templates/pullrequests/pullrequest.html b/kallithea/templates/pullrequests/pullrequest.html
--- a/kallithea/templates/pullrequests/pullrequest.html
+++ b/kallithea/templates/pullrequests/pullrequest.html
@@ -130,7 +130,7 @@ ${self.repo_context_bar('showpullrequest
 <script type="text/javascript">
   var _USERS_AC_DATA = ${c.users_array|n};
   var _GROUPS_AC_DATA = ${c.user_groups_array|n};
-  PullRequestAutoComplete('user', 'reviewers_container', _USERS_AC_DATA, _GROUPS_AC_DATA);
+  PullRequestAutoComplete('user', 'reviewers_container', _USERS_AC_DATA);
 
   pyroutes.register('pullrequest_repo_info', "${url('pullrequest_repo_info',repo_name='%(repo_name)s')}", ['repo_name']);
 
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
@@ -369,7 +369,7 @@ ${self.repo_context_bar('showpullrequest
 
     <script type="text/javascript">
       $(document).ready(function(){
-          PullRequestAutoComplete('user', 'reviewers_container', _USERS_AC_DATA, _GROUPS_AC_DATA);
+          PullRequestAutoComplete('user', 'reviewers_container', _USERS_AC_DATA);
 
           $('.add-bubble').click(function(e){
               var tr = e.currentTarget;