diff --git a/src/plugins/platforms/xcb/qxcbwindow.cpp b/src/plugins/platforms/xcb/qxcbwindow.cpp
index f4c455f278278dd5b650ddf4d2a7f734f664634e..d1c3d7039f194791fe25eb21e53b6f8c993f4b16 100644
--- a/src/plugins/platforms/xcb/qxcbwindow.cpp
+++ b/src/plugins/platforms/xcb/qxcbwindow.cpp
@@ -2366,7 +2366,7 @@ void QXcbWindow::handleXIMouseEvent(xcb_ge_event_t *event, Qt::MouseEventSource
             conn->setButton(conn->translateMouseButton(i), XIMaskIsSet(buttonMask, i));
     }
 
-    const char *sourceName = nullptr;
+    const char *sourceName = 0;
     if (lcQpaXInput().isDebugEnabled()) {
         const QMetaObject *metaObject = qt_getEnumMetaObject(source);
         const QMetaEnum me = metaObject->enumerator(metaObject->indexOfEnumerator(qt_getEnumName(source)));