diff --git a/target/linux/ramips/image/mt7621.mk b/target/linux/ramips/image/mt7621.mk
index bf700674ef5..495ba4f7da8 100644
--- a/target/linux/ramips/image/mt7621.mk
+++ b/target/linux/ramips/image/mt7621.mk
@@ -2384,6 +2384,7 @@ TARGET_DEVICES += sercomm_na502
 
 define Device/sercomm_na502s
   $(Device/nand)
+  $(Device/uimage-lzma-loader)
   IMAGE_SIZE := 20971520
   DEVICE_VENDOR := SERCOMM
   DEVICE_MODEL := NA502S