diff --git a/sound/soc/codecs/wm_adsp.c b/sound/soc/codecs/wm_adsp.c
index 6e348d49a89c..c9d9a7b28efb 100644
--- a/sound/soc/codecs/wm_adsp.c
+++ b/sound/soc/codecs/wm_adsp.c
@@ -7,6 +7,7 @@
  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
  */
 
+#include <linux/array_size.h>
 #include <linux/ctype.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>