diff --git a/src/wp-includes/session.php b/src/wp-includes/session.php
index ea44c0b3e9..88de25eb37 100644
--- a/src/wp-includes/session.php
+++ b/src/wp-includes/session.php
@@ -247,7 +247,7 @@ abstract class WP_Session_Tokens {
 	 *
 	 * @since 4.0.0
 	 */
-	abstract public static function drop_sessions();
+	public static function drop_sessions() {}
 }
 
 /**