diff --git a/pkgs/misc/screensavers/alock/default.nix b/pkgs/misc/screensavers/alock/default.nix
index 5b7c12dee1b..596668b0ce9 100644
--- a/pkgs/misc/screensavers/alock/default.nix
+++ b/pkgs/misc/screensavers/alock/default.nix
@@ -40,5 +40,6 @@ stdenv.mkDerivation rec {
     '';
     platforms = platforms.unix; # Cygwin had problems at one point
     maintainers = with maintainers; [ ftrvxmtrx chris-martin ];
+    license = licenses.mit;
   };
 }