diff --git a/pkgs/development/libraries/tre/default.nix b/pkgs/development/libraries/tre/default.nix
index 12f7e4c765d2..901b6aa097fd 100644
--- a/pkgs/development/libraries/tre/default.nix
+++ b/pkgs/development/libraries/tre/default.nix
@@ -16,5 +16,6 @@ stdenv.mkDerivation rec {
 
   meta = {
     platforms = stdenv.lib.platforms.unix;
+    license = stdenv.lib.licenses.bsd2;
   };
 }