diff --git a/drivers/net/wireless/ath/ar9170/cmd.c b/drivers/net/wireless/ath/ar9170/cmd.c
index 4604de09a8b28dc22aa140793acb59b6bf5f59a9..6452c5055a636ec76208b8c2532c094a85a6bec9 100644
--- a/drivers/net/wireless/ath/ar9170/cmd.c
+++ b/drivers/net/wireless/ath/ar9170/cmd.c
@@ -54,7 +54,7 @@ int ar9170_write_mem(struct ar9170 *ar, const __le32 *data, size_t len)
 
 int ar9170_write_reg(struct ar9170 *ar, const u32 reg, const u32 val)
 {
-	__le32 buf[2] = {
+	const __le32 buf[2] = {
 		cpu_to_le32(reg),
 		cpu_to_le32(val),
 	};