diff --git a/target/linux/realtek/rtl931x/target.mk b/target/linux/realtek/rtl931x/target.mk
index eaa6b61214c..62e88b41c6f 100644
--- a/target/linux/realtek/rtl931x/target.mk
+++ b/target/linux/realtek/rtl931x/target.mk
@@ -4,6 +4,7 @@ SUBTARGET:=rtl931x
 CPU_TYPE:=24kc
 BOARD:=realtek
 BOARDNAME:=Realtek MIPS RTL931X
+FEATURES+=source-only
 
 define Target/Description
 	Build firmware images for Realtek RTL931x based boards.