diff --git a/pkgs/desktops/lxqt/lxqt-config/default.nix b/pkgs/desktops/lxqt/lxqt-config/default.nix
index 151b24d53f34..be53a63748fe 100644
--- a/pkgs/desktops/lxqt/lxqt-config/default.nix
+++ b/pkgs/desktops/lxqt/lxqt-config/default.nix
@@ -64,6 +64,8 @@ stdenv.mkDerivation rec {
     xf86inputlibinput.dev
   ];
 
+  cmakeFlags = [ "-DCMAKE_CXX_STANDARD=20" ];
+
   postPatch = ''
     substituteInPlace lxqt-config-appearance/configothertoolkits.cpp \
       --replace-fail 'QStringLiteral("gsettings' \