diff --git a/drivers/net/wireless/ath/carl9170/fwcmd.h b/drivers/net/wireless/ath/carl9170/fwcmd.h
index 4a500095555c6..ff4b3b50250c6 100644
--- a/drivers/net/wireless/ath/carl9170/fwcmd.h
+++ b/drivers/net/wireless/ath/carl9170/fwcmd.h
@@ -118,10 +118,10 @@ struct carl9170_reg_list {
 } __packed;
 
 struct carl9170_write_reg {
-	struct {
+	DECLARE_FLEX_ARRAY(struct {
 		__le32		addr;
 		__le32		val;
-	} regs[0] __packed;
+	} __packed, regs);
 } __packed;
 
 struct carl9170_write_reg_byte {