diff --git a/drivers/usb/host/ehci-ppc4xx.c b/drivers/usb/host/ehci-ppc4xx.c
index 9aee3ff..9d23577 100644
--- a/drivers/usb/host/ehci-ppc4xx.c
+++ b/drivers/usb/host/ehci-ppc4xx.c
@@ -8,6 +8,7 @@
  */
 #include <common.h>
 #include <usb.h>
+#include <asm/io.h>
 
 #include "ehci.h"