diff --git a/pkgs/applications/networking/instant-messengers/telegram/tdesktop/generic.nix b/pkgs/applications/networking/instant-messengers/telegram/tdesktop/generic.nix
index a49ef87f540..7027e70f0c8 100644
--- a/pkgs/applications/networking/instant-messengers/telegram/tdesktop/generic.nix
+++ b/pkgs/applications/networking/instant-messengers/telegram/tdesktop/generic.nix
@@ -117,6 +117,7 @@ mkDerivation rec {
     # This is necessary to run Telegram in a pure environment.
     wrapProgram $out/bin/telegram-desktop \
       --prefix QT_PLUGIN_PATH : "${qtbase}/${qtbase.qtPluginPrefix}" \
+      --suffix XDG_DATA_DIRS : "${gtk3}/share/gsettings-schemas/${gtk3.name}/" \
       --set XDG_RUNTIME_DIR "XDG-RUNTIME-DIR"
     sed -i $out/bin/telegram-desktop \
       -e "s,'XDG-RUNTIME-DIR',\"\''${XDG_RUNTIME_DIR:-/run/user/\$(id --user)}\","