diff --git a/utils/ap51-flash/Makefile b/utils/ap51-flash/Makefile
index c9827cf22..f0ac74b2f 100644
--- a/utils/ap51-flash/Makefile
+++ b/utils/ap51-flash/Makefile
@@ -17,6 +17,8 @@ PKG_SOURCE_VERSION:=f94f9c99711d14a3c0186318d822d67d9d0ce391
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION)-$(PKG_SOURCE_VERSION).tar.xz
 PKG_MIRROR_HASH:=15786a0ecae9be5ed4e8f32940624d1a1c83da924294df08003616a863947074
 PKG_MAINTAINER:=Russell Senior <russell@personaltelco.net>
+PKG_LICENSE:=GPL-3.0+
+PKG_LICENSE_FILES:=LICENSES/preferred/GPL-3.0
 
 include $(INCLUDE_DIR)/package.mk