diff --git a/drivers/mfd/intel_msic.c b/drivers/mfd/intel_msic.c
index bd086b9..97c2776 100644
--- a/drivers/mfd/intel_msic.c
+++ b/drivers/mfd/intel_msic.c
@@ -10,6 +10,7 @@
  */
 
 #include <linux/gpio.h>
+#include <linux/io.h>
 #include <linux/module.h>
 #include <linux/mfd/core.h>
 #include <linux/mfd/intel_msic.h>