diff --git a/sound/soc/codecs/rt5640.c b/sound/soc/codecs/rt5640.c
index 68b4dd622b87..635363cb73e9 100644
--- a/sound/soc/codecs/rt5640.c
+++ b/sound/soc/codecs/rt5640.c
@@ -18,6 +18,7 @@
 #include <linux/gpio.h>
 #include <linux/i2c.h>
 #include <linux/regmap.h>
+#include <linux/of.h>
 #include <linux/of_gpio.h>
 #include <linux/platform_device.h>
 #include <linux/spi/spi.h>