diff --git a/drivers/usb/serial/io_edgeport.c b/drivers/usb/serial/io_edgeport.c
index 4cf77ead9334..34ccf7820537 100644
--- a/drivers/usb/serial/io_edgeport.c
+++ b/drivers/usb/serial/io_edgeport.c
@@ -25,6 +25,7 @@
  *
  */
 
+#include <linux/atomic.h>
 #include <linux/kernel.h>
 #include <linux/jiffies.h>
 #include <linux/errno.h>
diff --git a/drivers/usb/serial/mos7720.c b/drivers/usb/serial/mos7720.c
index bc3b631041a9..104f43a8f4d8 100644
--- a/drivers/usb/serial/mos7720.c
+++ b/drivers/usb/serial/mos7720.c
@@ -17,6 +17,8 @@
  *	Copyright (C) 2000 Inside Out Networks, All rights reserved.
  *	Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
  */
+
+#include <linux/atomic.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/slab.h>