diff --git a/pkgs/tools/inputmethods/fcitx5/fcitx5-configtool.nix b/pkgs/tools/inputmethods/fcitx5/fcitx5-configtool.nix
index 069f121baa77..e5e4fe245f9f 100644
--- a/pkgs/tools/inputmethods/fcitx5/fcitx5-configtool.nix
+++ b/pkgs/tools/inputmethods/fcitx5/fcitx5-configtool.nix
@@ -62,5 +62,6 @@ mkDerivation rec {
     license = licenses.gpl2Plus;
     maintainers = with maintainers; [ poscat ];
     platforms = platforms.linux;
+    mainProgram = "fcitx5-config-qt";
   };
 }