diff --git a/src/xdgactivationv1.cpp b/src/xdgactivationv1.cpp
index 9048e25f2a..9334a14233 100644
--- a/src/xdgactivationv1.cpp
+++ b/src/xdgactivationv1.cpp
@@ -42,7 +42,7 @@ static const QString windowDesktopFileName(Window *window)
     // Fallback to StartupWMClass for legacy apps
     const auto resourceName = window->resourceName();
     const auto service = KApplicationTrader::query([&resourceName](const KService::Ptr &service) {
-        return service->property("StartupWMClass") == resourceName;
+        return service->property("StartupWMClass").toString().compare(resourceName, Qt::CaseInsensitive) == 0;
     });
 
     if (!service.isEmpty()) {