diff --git a/sound/hda/hdac_bus.c b/sound/hda/hdac_bus.c
index dc2523ef7d98b5938fc6a6a7385c5234e884bc55..cd25e2b3f7f224be60753d3d1d7d4b7eec7069b0 100644
--- a/sound/hda/hdac_bus.c
+++ b/sound/hda/hdac_bus.c
@@ -4,6 +4,7 @@
  */
 
 #include <linux/init.h>
+#include <linux/io.h>
 #include <linux/device.h>
 #include <linux/module.h>
 #include <linux/export.h>