diff --git a/drivers/sbus/char/envctrl.c b/drivers/sbus/char/envctrl.c
index f2be2ead874..8328acab47f 100644
--- a/drivers/sbus/char/envctrl.c
+++ b/drivers/sbus/char/envctrl.c
@@ -30,6 +30,7 @@
 #include <asm/ebus.h>
 #include <asm/uaccess.h>
 #include <asm/envctrl.h>
+#include <asm/io.h>
 
 #define ENVCTRL_MINOR	162