diff --git a/utils/rrdtool1/Makefile b/utils/rrdtool1/Makefile
index f1da0ace2e..29f1d61023 100644
--- a/utils/rrdtool1/Makefile
+++ b/utils/rrdtool1/Makefile
@@ -17,6 +17,9 @@ PKG_SOURCE_URL:=http://oss.oetiker.ch/rrdtool/pub/archive/rrdtool-1.0.x
 PKG_HASH:=42aa7c213dedbd95d33ca84d92f4187880f7e96062c6a3fb05bfb16f77ba2a91
 PKG_MAINTAINER:=Jo-Philipp Wich <jo@mein.io>
 
+PKG_LICENSE:=GPL-2.0-or-later
+PKG_LICENSE_FILES:=COPYING COPYRIGHT
+
 PKG_FIXUP:=autoreconf
 PKG_CHECK_FORMAT_SECURITY:=0