diff --git a/map-agent/Makefile b/map-agent/Makefile
index 7a026f25f..b754fc906 100644
--- a/map-agent/Makefile
+++ b/map-agent/Makefile
@@ -72,6 +72,7 @@ endif
 
 ifeq ($(CONFIG_AGENT_EASYMESH_VENDOR_EXT),y)
 TARGET_CFLAGS += -DEASYMESH_VENDOR_EXT_OUI=\\\"$(CONFIG_AGENT_EASYMESH_VENDOR_EXT_OUI)\\\"
+TARGET_CFLAGS += -DEASYMESH_VENDOR_EXT
 endif