diff --git a/user/selector/lib.php b/user/selector/lib.php
index 71cf1311780..f1d95336ab5 100644
--- a/user/selector/lib.php
+++ b/user/selector/lib.php
@@ -137,7 +137,7 @@ abstract class user_selector_base {
      * Clear the list of excluded user ids.
      */
     public function clear_exclusions() {
-        $exclude = array();
+        $this->exclude = array();
     }
 
     /**