diff --git a/sound/soc/codecs/wm8940.c b/sound/soc/codecs/wm8940.c
index d28bf0d..2cb16f8 100644
--- a/sound/soc/codecs/wm8940.c
+++ b/sound/soc/codecs/wm8940.c
@@ -750,7 +750,7 @@
 	.suspend =	wm8940_suspend,
 	.resume =	wm8940_resume,
 	.set_bias_level = wm8940_set_bias_level,
-	.reg_cache_size = sizeof(wm8940_reg_defaults),
+	.reg_cache_size = ARRAY_SIZE(wm8940_reg_defaults),
 	.reg_word_size = sizeof(u16),
 	.reg_cache_default = wm8940_reg_defaults,
 };