diff --git a/package/rrdtool/rrdtool.mk b/package/rrdtool/rrdtool.mk
index 7521aba992..d3b63ea8a9 100644
--- a/package/rrdtool/rrdtool.mk
+++ b/package/rrdtool/rrdtool.mk
@@ -6,6 +6,9 @@
 
 RRDTOOL_VERSION = 1.2.30
 RRDTOOL_SITE = http://oss.oetiker.ch/rrdtool/pub
+RRDTOOL_LICENSE = GPLv2+ with FLOSS license exceptions as explained in COPYRIGHT
+RRDTOOL_LICENSE_FILES = COPYING COPYRIGHT
+
 RRDTOOL_DEPENDENCIES = host-pkgconf freetype libart libpng zlib
 RRDTOOL_AUTORECONF = YES
 RRDTOOL_INSTALL_STAGING = YES