diff --git a/wp-includes/capabilities.php b/wp-includes/capabilities.php
index e30ff4313..236c88461 100644
--- a/wp-includes/capabilities.php
+++ b/wp-includes/capabilities.php
@@ -84,7 +84,7 @@ class WP_Role {
 		global $wp_roles;
 
 		$this->capabilities[$cap] = $grant;
-		$wp_roles->add_cap($this->name, $cap);
+		$wp_roles->add_cap($this->name, $cap, $grant);
 	}
 
 	function remove_cap($cap) {