diff --git a/pkgs/by-name/sr/srb2/package.nix b/pkgs/by-name/sr/srb2/package.nix
index 8bde0f0b348d..5f341e73031b 100644
--- a/pkgs/by-name/sr/srb2/package.nix
+++ b/pkgs/by-name/sr/srb2/package.nix
@@ -96,6 +96,7 @@ stdenv.mkDerivation (finalAttrs: {
       desktopName = name;
       genericName = name;
       categories = [ "Game" ];
+      startupWMClass = ".srb2-wrapped";
     })
   ];