diff --git a/drivers/sbus/char/cpwatchdog.c b/drivers/sbus/char/cpwatchdog.c
index 022e869c44ddf77373370e4b0ee57e49342b9508..7b5773d882127cd0b935468cfa4b58a682a6a920 100644
--- a/drivers/sbus/char/cpwatchdog.c
+++ b/drivers/sbus/char/cpwatchdog.c
@@ -24,6 +24,7 @@
 #include <linux/ioport.h>
 #include <linux/timer.h>
 #include <linux/smp_lock.h>
+#include <linux/io.h>
 #include <asm/irq.h>
 #include <asm/ebus.h>
 #include <asm/oplib.h>