diff --git a/admin/roles/lib.php b/admin/roles/lib.php
index 3e9624eece2..7fc5782eb2d 100644
--- a/admin/roles/lib.php
+++ b/admin/roles/lib.php
@@ -1316,6 +1316,7 @@ abstract class role_allow_role_page {
         foreach ($rs as $allow) {
             $this->allowed[$allow->roleid][$allow->{$this->targetcolname}] = true;
         }
+        $rs->close();
     }
 
     /**