diff --git a/target/linux/ramips/image/mt7621.mk b/target/linux/ramips/image/mt7621.mk
index 99884ec1d9029f..18a29270d7a9f4 100644
--- a/target/linux/ramips/image/mt7621.mk
+++ b/target/linux/ramips/image/mt7621.mk
@@ -162,6 +162,8 @@ define Device/asus_rt-ac57u
   $(Device/dsa-migration)
   DEVICE_VENDOR := ASUS
   DEVICE_MODEL := RT-AC57U
+  DEVICE_ALT0_VENDOR := ASUS
+  DEVICE_ALT0_MODEL := RT-AC1200GU
   IMAGE_SIZE := 16064k
   DEVICE_PACKAGES := kmod-mt7603 kmod-mt76x2 kmod-usb3 \
 	kmod-usb-ledtrig-usbport