diff --git a/target/linux/ramips/image/mt7621.mk b/target/linux/ramips/image/mt7621.mk
index d456176a017..e20a3e99aa7 100644
--- a/target/linux/ramips/image/mt7621.mk
+++ b/target/linux/ramips/image/mt7621.mk
@@ -1973,6 +1973,7 @@ TARGET_DEVICES += samknows_whitebox-v8
 
 define Device/sercomm_na502
   $(Device/nand)
+  $(Device/uimage-lzma-loader)
   IMAGE_SIZE := 20480k
   DEVICE_VENDOR := SERCOMM
   DEVICE_MODEL := NA502