diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 235e305..d538893 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -32,6 +32,7 @@
 #undef VERBOSE_DEBUG
 
 #include <linux/kernel.h>
+#include <linux/sched/signal.h>
 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/slab.h>