diff --git a/map-controller/Makefile b/map-controller/Makefile
index 71f10c8a7..1dc816164 100644
--- a/map-controller/Makefile
+++ b/map-controller/Makefile
@@ -50,6 +50,7 @@ endif
 
 ifeq ($(CONFIG_CONTROLLER_EASYMESH_VENDOR_EXT),y)
 TARGET_CFLAGS += -DEASYMESH_VENDOR_EXT_OUI=\\\"$(CONFIG_CONTROLLER_EASYMESH_VENDOR_EXT_OUI)\\\"
+TARGET_CFLAGS += -DEASYMESH_VENDOR_EXT
 endif
 
 define Package/map-controller/install