diff --git a/drivers/usb/gadget/f_acm.c b/drivers/usb/gadget/f_acm.c
index e49c732..400e1eb 100644
--- a/drivers/usb/gadget/f_acm.c
+++ b/drivers/usb/gadget/f_acm.c
@@ -14,6 +14,7 @@
 
 /* #define VERBOSE_DEBUG */
 
+#include <linux/slab.h>
 #include <linux/kernel.h>
 #include <linux/device.h>