diff --git a/kernel/busses/i2c-sis645.c b/kernel/busses/i2c-sis645.c
index dff8203e..c96037ef 100644
--- a/kernel/busses/i2c-sis645.c
+++ b/kernel/busses/i2c-sis645.c
@@ -42,6 +42,7 @@
 #include <linux/ioport.h>
 #include <linux/i2c.h>
 #include <linux/init.h>
+#include <linux/mm.h>
 #include <asm/io.h>
 #include "version.h"