diff --git a/drivers/tty/serial/mux.c b/drivers/tty/serial/mux.c
index 47ab280f553b..be640d9863cd 100644
--- a/drivers/tty/serial/mux.c
+++ b/drivers/tty/serial/mux.c
@@ -21,7 +21,7 @@
 #include <linux/console.h>
 #include <linux/delay.h> /* for udelay */
 #include <linux/device.h>
-#include <asm/io.h>
+#include <linux/io.h>
 #include <asm/irq.h>
 #include <asm/parisc-device.h>