diff --git a/asoc/codecs/audio-ext-clk-up.c b/asoc/codecs/audio-ext-clk-up.c
index 632f6744b2..c2c3074daa 100644
--- a/asoc/codecs/audio-ext-clk-up.c
+++ b/asoc/codecs/audio-ext-clk-up.c
@@ -4,6 +4,7 @@
 
 #include <linux/kernel.h>
 #include <linux/init.h>
+#include <linux/io.h>
 #include <linux/err.h>
 #include <linux/module.h>
 #include <linux/of.h>