diff --git a/drivers/serial/bfin_5xx.c b/drivers/serial/bfin_5xx.c
index 6b8795557b388f17f38f4fa009a6c5832e341e68..fcf273e3f48c5faee2741e316d7de927d3ac204e 100644
--- a/drivers/serial/bfin_5xx.c
+++ b/drivers/serial/bfin_5xx.c
@@ -14,6 +14,7 @@
 
 #include <linux/module.h>
 #include <linux/ioport.h>
+#include <linux/io.h>
 #include <linux/init.h>
 #include <linux/console.h>
 #include <linux/sysrq.h>