diff --git a/pkgs/by-name/te/tetrio-desktop/package.nix b/pkgs/by-name/te/tetrio-desktop/package.nix
index a7ba025f0029..2e29cae9eeb1 100644
--- a/pkgs/by-name/te/tetrio-desktop/package.nix
+++ b/pkgs/by-name/te/tetrio-desktop/package.nix
@@ -75,7 +75,8 @@ stdenv.mkDerivation {
         cp ${asarPath} $out/share/TETR.IO/app.asar
 
         substituteInPlace $out/share/applications/TETR.IO.desktop \
-          --replace-fail "Exec=/opt/TETR.IO/TETR.IO" "Exec=$out/bin/tetrio"
+          --replace-fail "Exec=/opt/TETR.IO/TETR.IO" "Exec=$out/bin/tetrio" \
+          --replace-fail "StartupWMClass=TETR.IO" "StartupWMClass=tetrio-desktop"
 
         runHook postInstall
       '';