diff --git a/drivers/usb/gadget/f_loopback.c b/drivers/usb/gadget/f_loopback.c
index 6cb29d3..e91d1b1 100644
--- a/drivers/usb/gadget/f_loopback.c
+++ b/drivers/usb/gadget/f_loopback.c
@@ -21,6 +21,7 @@
 
 /* #define VERBOSE_DEBUG */
 
+#include <linux/slab.h>
 #include <linux/kernel.h>
 #include <linux/device.h>