diff --git a/pkgs/tools/graphics/barcode/default.nix b/pkgs/tools/graphics/barcode/default.nix
index 7ed2cc8b6aaf..4fa9fff97d39 100644
--- a/pkgs/tools/graphics/barcode/default.nix
+++ b/pkgs/tools/graphics/barcode/default.nix
@@ -18,5 +18,6 @@ stdenv.mkDerivation rec {
     downloadPage = "http://ftp.gnu.org/gnu/barcode/";
     updateWalker = true;
     homepage = http://ftp.gnu.org/gnu/barcode/;
+    license = licenses.gpl3;
   };
 }