diff --git a/drivers/usb/gadget/u_serial.c b/drivers/usb/gadget/u_serial.c
index 3e8dcb5455e3a4912f7bc0fc525b69c524cade7f..01e5354a4c20ffd5b072fdff6a828d08e9049317 100644
--- a/drivers/usb/gadget/u_serial.c
+++ b/drivers/usb/gadget/u_serial.c
@@ -18,6 +18,7 @@
 /* #define VERBOSE_DEBUG */
 
 #include <linux/kernel.h>
+#include <linux/sched.h>
 #include <linux/interrupt.h>
 #include <linux/device.h>
 #include <linux/delay.h>