diff --git a/drivers/usb/serial/sierra.c b/drivers/usb/serial/sierra.c
index d423d36..7d7ab91 100644
--- a/drivers/usb/serial/sierra.c
+++ b/drivers/usb/serial/sierra.c
@@ -964,6 +964,7 @@ static void sierra_release(struct usb_serial *serial)
 			continue;
 		kfree(portdata);
 	}
+	kfree(serial->private);
 }
 
 #ifdef CONFIG_PM