diff --git a/target/linux/mediatek/files-5.10/drivers/leds/leds-ubnt-ledbar.c b/target/linux/mediatek/files-5.10/drivers/leds/leds-ubnt-ledbar.c
index 9bfe0e62f49..8168391d7e7 100644
--- a/target/linux/mediatek/files-5.10/drivers/leds/leds-ubnt-ledbar.c
+++ b/target/linux/mediatek/files-5.10/drivers/leds/leds-ubnt-ledbar.c
@@ -26,7 +26,7 @@
 #define UBNT_LEDBAR_MAX_BRIGHTNESS	0xff
 
 #define UBNT_LEDBAR_TRANSACTION_LENGTH	8
-#define UBNT_LEDBAR_TRANSACTION_SUCCESS	0xaa
+#define UBNT_LEDBAR_TRANSACTION_SUCCESS	(char) 0xaa
 
 #define UBNT_LEDBAR_TRANSACTION_BLUE_IDX	2
 #define UBNT_LEDBAR_TRANSACTION_GREEN_IDX	3