diff --git a/sound/soc/soc-cache.c b/sound/soc/soc-cache.c
index 91db7af..9dfe9a5 100644
--- a/sound/soc/soc-cache.c
+++ b/sound/soc/soc-cache.c
@@ -159,7 +159,8 @@
 
 	BUG_ON(codec->volatile_register);
 
-	data[0] = reg & 0xff;
+	reg &= 0xff;
+	data[0] = reg;
 	data[1] = value & 0xff;
 
 	if (reg < codec->reg_cache_size)
@@ -180,6 +181,7 @@
 				     unsigned int reg)
 {
 	u8 *cache = codec->reg_cache;
+	reg &= 0xff;
 	if (reg >= codec->reg_cache_size)
 		return -1;
 	return cache[reg];