diff --git a/kernel/ksud.c b/kernel/ksud.c
index 8e9c888c..4e20f6e0 100644
--- a/kernel/ksud.c
+++ b/kernel/ksud.c
@@ -1,5 +1,6 @@
 #include "asm/current.h"
 #include "linux/string.h"
+#include "linux/compat.h"
 #include "linux/cred.h"
 #include "linux/dcache.h"
 #include "linux/err.h"