diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 457dd8c97e0d1838d896934020270a9bfd60fadb..2230b46f9e1c0d659e29fe3369c65f79d9dc975c 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -30,6 +30,7 @@
 #include <linux/percpu.h>
 #include <linux/splice.h>
 #include <linux/kdebug.h>
+#include <linux/string.h>
 #include <linux/ctype.h>
 #include <linux/init.h>
 #include <linux/poll.h>