diff --git a/pkgs/by-name/ru/runelite/package.nix b/pkgs/by-name/ru/runelite/package.nix
index 158cc94fb9ce..883d5945183a 100644
--- a/pkgs/by-name/ru/runelite/package.nix
+++ b/pkgs/by-name/ru/runelite/package.nix
@@ -34,6 +34,7 @@ maven.buildMavenPackage rec {
     desktopName = "RuneLite";
     genericName = "Oldschool Runescape";
     categories = [ "Game" ];
+    startupWMClass = "net-runelite-client-RuneLite";
   };
 
   # tests require internet :(