diff --git a/admin/roles/classes/capability_table_base.php b/admin/roles/classes/capability_table_base.php
index c95cf363c0b..7a81b4bea6b 100644
--- a/admin/roles/classes/capability_table_base.php
+++ b/admin/roles/classes/capability_table_base.php
@@ -43,7 +43,7 @@ abstract class core_role_capability_table_base {
     protected $id;
 
     /** Added to the class="" attribute on output. */
-    protected $classes = array('rolecap table-hover');
+    protected $classes = ['rolecap table w-auto table-hover'];
 
     /** Default number of capabilities in the table for the search UI to be shown. */
     const NUM_CAPS_FOR_SEARCH = 12;