diff --git lib/utils/x11utils.cpp lib/utils/x11utils.cpp
index 40339e3..44e30df 100644
--- lib/utils/x11utils.cpp
+++ lib/utils/x11utils.cpp
@@ -67,7 +67,7 @@ static const struct {
{&qtc_x11_qtc_menubar_size, "_QTCURVE_MENUBAR_SIZE_"},
{&qtc_x11_qtc_statusbar, "_QTCURVE_STATUSBAR_"},
{&qtc_x11_qtc_titlebar_size, "_QTCURVE_TITLEBAR_SIZE_"},
- {&qtc_x11_qtc_active_window, "_QTCURVE_ACTIVE_WINDOW_"},
+ {&qtc_x11_qtc_active_window, "_NET_ACTIVE_WINDOW_"},
{&qtc_x11_qtc_toggle_menubar, "_QTCURVE_TOGGLE_MENUBAR_"},
{&qtc_x11_qtc_toggle_statusbar, "_QTCURVE_TOGGLE_STATUSBAR_"},
{&qtc_x11_qtc_opacity, "_QTCURVE_OPACITY_"},
diff --git qt4/kwin/qtcurveclient.cpp qt4/kwin/qtcurveclient.cpp
index 80855cf..3d1be06 100644
--- qt4/kwin/qtcurveclient.cpp
+++ qt4/kwin/qtcurveclient.cpp
@@ -1120,6 +1120,7 @@ void QtCurveClient::deleteSizeGrip()
void QtCurveClient::informAppOfBorderSizeChanges()
+#ifdef X11_SEND_QTCURVE_SPECIFIC_EVENTS
xcb_client_message_event_t ev;
@@ -1131,6 +1132,7 @@ void QtCurveClient::informAppOfBorderSizeChanges()
xev->type = qtc_x11_qtc_titlebar_size;
qtcX11SendEvent(false, windowId(), XCB_EVENT_MASK_NO_EVENT, xev);
@@ -1138,6 +1140,7 @@ void QtCurveClient::informAppOfActiveChange()
if (Handler()->wStyle()->pixelMetric(
(QStyle::PixelMetric)QtC_ShadeMenubarOnlyWhenActive, nullptr, nullptr)) {
+#ifdef X11_SEND_QTCURVE_SPECIFIC_EVENTS
xcb_client_message_event_t ev;
@@ -1149,6 +1152,7 @@ void QtCurveClient::informAppOfActiveChange()
xev->type = qtc_x11_qtc_active_window;
xev->data.data32[0] = isActive() ? 1 : 0;
qtcX11SendEvent(false, windowId(), XCB_EVENT_MASK_NO_EVENT, xev);
diff --git qt5/kwin/qtcurveclient.cpp qt5/kwin/qtcurveclient.cpp
index d784bd4..821b587 100644
--- qt5/kwin/qtcurveclient.cpp
+++ qt5/kwin/qtcurveclient.cpp
@@ -1121,6 +1121,7 @@ void QtCurveClient::deleteSizeGrip()
void QtCurveClient::informAppOfBorderSizeChanges()
+#ifdef X11_SEND_QTCURVE_SPECIFIC_EVENTS
xcb_client_message_event_t ev;
@@ -1132,6 +1133,7 @@ void QtCurveClient::informAppOfBorderSizeChanges()
xev->type = qtc_x11_qtc_titlebar_size;