diff --git a/kcmkwin/kwinrules/detectwidget.cpp b/kcmkwin/kwinrules/detectwidget.cpp
index 035acc1b45..1def56a9bd 100644
--- a/kcmkwin/kwinrules/detectwidget.cpp
+++ b/kcmkwin/kwinrules/detectwidget.cpp
@@ -78,19 +78,19 @@ void DetectDialog::readWindow(WId w)
         emit detectionDone(false);
         return;
     }
-    info = KWindowSystem::windowInfo(w, -1U, -1U);   // read everything
-    if (!info.valid()) {
+    info.reset(new KWindowInfo(w, -1U, -1U));   // read everything
+    if (!info->valid()) {
         emit detectionDone(false);
         return;
     }
-    wmclass_class = info.windowClassClass();
-    wmclass_name = info.windowClassName();
-    role = info.windowRole();
-    type = info.windowType(NET::NormalMask | NET::DesktopMask | NET::DockMask
+    wmclass_class = info->windowClassClass();
+    wmclass_name = info->windowClassName();
+    role = info->windowRole();
+    type = info->windowType(NET::NormalMask | NET::DesktopMask | NET::DockMask
                            | NET::ToolbarMask | NET::MenuMask | NET::DialogMask | NET::OverrideMask | NET::TopMenuMask
                            | NET::UtilityMask | NET::SplashMask);
-    title = info.name();
-    machine = info.clientMachine();
+    title = info->name();
+    machine = info->clientMachine();
     executeDialog();
 }
 
diff --git a/kcmkwin/kwinrules/detectwidget.h b/kcmkwin/kwinrules/detectwidget.h
index 6c7e4efac3..efc8980c41 100644
--- a/kcmkwin/kwinrules/detectwidget.h
+++ b/kcmkwin/kwinrules/detectwidget.h
@@ -77,13 +77,14 @@ private:
     QByteArray machine;
     DetectWidget* widget;
     QScopedPointer<QDialog> grabber;
-    KWindowInfo info;
+    QScopedPointer<KWindowInfo> info;
 };
 
 inline
 const KWindowInfo& DetectDialog::windowInfo() const
 {
-    return info;
+    Q_ASSERT(!info.isNull());
+    return *(info.data());
 }
 
 } // namespace