diff --git a/pkgs/development/libraries/java/smack/default.nix b/pkgs/development/libraries/java/smack/default.nix
index c39478e590dd..e28925c65bb2 100644
--- a/pkgs/development/libraries/java/smack/default.nix
+++ b/pkgs/development/libraries/java/smack/default.nix
@@ -11,5 +11,6 @@ stdenv.mkDerivation {
 
   meta = {
     platforms = stdenv.lib.platforms.unix;
+    license = stdenv.lib.licenses.asl20;
   };
 }