diff --git a/pkgs/development/tools/ocaml/opam/default.nix b/pkgs/development/tools/ocaml/opam/default.nix
index 73b7da119ab..7e84719ae47 100644
--- a/pkgs/development/tools/ocaml/opam/default.nix
+++ b/pkgs/development/tools/ocaml/opam/default.nix
@@ -87,5 +87,6 @@ in stdenv.mkDerivation rec {
     homepage = http://opam.ocamlpro.com/;
     maintainers = [ maintainers.henrytill ];
     platforms = platforms.all;
+    license = licenses.lgpl21Plus;
   };
 }