diff --git a/lib/private/group/group.php b/lib/private/group/group.php
index 9965d938ebb2670c9c5647f56ecafea1b1a1b183..a2b8a0dcbea7077391e6007fcb842380a8b88ae9 100644
--- a/lib/private/group/group.php
+++ b/lib/private/group/group.php
@@ -195,7 +195,7 @@ class Group {
 	public function count($search) {
 		$users = false;
 		foreach ($this->backends as $backend) {
-			if(method_exists($backend, 'countUsersInGroup')) {
+			if($backend->implementsActions(OC_GROUP_BACKEND_COUNT_USERS)) {
 				if($users === false) {
 					//we could directly add to a bool variable, but this would
 					//be ugly