diff --git a/doctrine/pdo_session_storage.rst b/doctrine/pdo_session_storage.rst
index fe6081d1c06..3c21c61f5a8 100644
--- a/doctrine/pdo_session_storage.rst
+++ b/doctrine/pdo_session_storage.rst
@@ -254,7 +254,7 @@ MySQL
         `sess_id` VARCHAR(128) NOT NULL PRIMARY KEY,
         `sess_data` BLOB NOT NULL,
         `sess_time` INTEGER UNSIGNED NOT NULL,
-        `sess_lifetime` MEDIUMINT NOT NULL
+        `sess_lifetime` INTEGER UNSIGNED NOT NULL
     ) COLLATE utf8mb4_bin, ENGINE = InnoDB;
 
 .. note::