diff --git a/pkgs/development/libraries/mono-zeroconf/default.nix b/pkgs/development/libraries/mono-zeroconf/default.nix
index d96f90b4bfd..37195d38562 100644
--- a/pkgs/development/libraries/mono-zeroconf/default.nix
+++ b/pkgs/development/libraries/mono-zeroconf/default.nix
@@ -20,5 +20,6 @@ stdenv.mkDerivation rec {
     description = "A cross platform Zero Configuration Networking library for Mono and .NET";
     homepage = http://www.mono-project.com/archived/monozeroconf/;
     platforms = platforms.linux;
+    license = licenses.mit;
   };
 }