diff --git a/src/core/engine/engine.cpp b/src/core/engine/engine.cpp
index 23fbb024..b3cefbf9 100644
--- a/src/core/engine/engine.cpp
+++ b/src/core/engine/engine.cpp
@@ -21,7 +21,7 @@ void Engine::addWindow(PlasmaApi::Client client)
 {
     // Don't manage special windows - docks, panels, etc.
     // Also don't tile launchers
-    if (client.specialWindow() || client.resourceClass() == QByteArrayLiteral("krunner")) {
+    if (client.specialWindow() || client.dialog() || client.resourceClass() == QByteArrayLiteral("krunner")) {
         return;
     }
 
diff --git a/src/core/plasma-api/toplevel.hpp b/src/core/plasma-api/toplevel.hpp
index 4152a5ed..b40aa9c2 100644
--- a/src/core/plasma-api/toplevel.hpp
+++ b/src/core/plasma-api/toplevel.hpp
@@ -25,9 +25,8 @@ public:
     /**
      * Whether the window is a dialog window.
      */
-    // Q_PROPERTY(bool dialog READ dialog)
-    // BOOL_PRIMITIVE_GET(dialog)
-    //
+    BI_READONLY_PROPERTY(bool, dialog)
+
     // /**
     //  * Frame geometry
     //  */