diff --git a/target/linux/ramips/image/mt7621.mk b/target/linux/ramips/image/mt7621.mk
index fd40b6f0a63..9644b14c3f8 100644
--- a/target/linux/ramips/image/mt7621.mk
+++ b/target/linux/ramips/image/mt7621.mk
@@ -297,6 +297,8 @@ define Device/asus_rt-ax53u
   $(Device/dsa-migration)
   DEVICE_VENDOR := ASUS
   DEVICE_MODEL := RT-AX53U
+  DEVICE_ALT0_VENDOR := ASUS
+  DEVICE_ALT0_MODEL := RT-AX1800U
   IMAGE_SIZE := 51200k
   UBINIZE_OPTS := -E 5
   BLOCKSIZE := 128k