diff --git a/pkgs/by-name/jo/joplin-desktop/package.nix b/pkgs/by-name/jo/joplin-desktop/package.nix
index 4adca9bc59c6..bf60e0fd38f2 100644
--- a/pkgs/by-name/jo/joplin-desktop/package.nix
+++ b/pkgs/by-name/jo/joplin-desktop/package.nix
@@ -64,6 +64,7 @@ let
       install -Dm644 ${appimageContents}/joplin.desktop $out/share/applications/joplin.desktop
       install -Dm644 ${appimageContents}/joplin.png $out/share/pixmaps/joplin.png
       substituteInPlace $out/share/applications/joplin.desktop \
+        --replace-fail StartupWMClass=Joplin StartupWMClass=@joplin/app-desktop \
         --replace-fail 'Exec=AppRun' 'Exec=joplin-desktop'
     '';