diff --git a/target/linux/ramips/image/mt7621.mk b/target/linux/ramips/image/mt7621.mk
index 16794c4f50..3dd6574bf1 100644
--- a/target/linux/ramips/image/mt7621.mk
+++ b/target/linux/ramips/image/mt7621.mk
@@ -2064,6 +2064,7 @@ TARGET_DEVICES += samknows_whitebox-v8
 
 define Device/sercomm_na502
   $(Device/nand)
+  $(Device/uimage-lzma-loader)
   IMAGE_SIZE := 20480k
   DEVICE_VENDOR := SERCOMM
   DEVICE_MODEL := NA502