diff --git a/pkgs/tools/inputmethods/fcitx5/fcitx5-gtk.nix b/pkgs/tools/inputmethods/fcitx5/fcitx5-gtk.nix
index 0dfa9f822a29..78e43f78503e 100644
--- a/pkgs/tools/inputmethods/fcitx5/fcitx5-gtk.nix
+++ b/pkgs/tools/inputmethods/fcitx5/fcitx5-gtk.nix
@@ -35,6 +35,8 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-xVBmFFUnlWqviht/KGFTHCd3xCln/6hyBG72tIHqopc=";
   };
 
+  outputs = [ "out" "dev" ];
+
   cmakeFlags = [
     "-DGOBJECT_INTROSPECTION_GIRDIR=share/gir-1.0"
     "-DGOBJECT_INTROSPECTION_TYPELIBDIR=lib/girepository-1.0"