diff --git a/src/plugins/platforms/eglfs/deviceintegration/eglfs_x11/qeglfsx11integration.cpp b/src/plugins/platforms/eglfs/deviceintegration/eglfs_x11/qeglfsx11integration.cpp
index 8dd468bff38..cfe735352d7 100644
--- a/src/plugins/platforms/eglfs/deviceintegration/eglfs_x11/qeglfsx11integration.cpp
+++ b/src/plugins/platforms/eglfs/deviceintegration/eglfs_x11/qeglfsx11integration.cpp
@@ -25,7 +25,7 @@ private:
     QEglFSX11Integration *m_integration;
 };
 
-Q_CONSTINIT static QBasicAtomicInt running;
+Q_CONSTINIT static QBasicAtomicInt running = Q_BASIC_ATOMIC_INITIALIZER(0);
 
 void EventReader::run()
 {
diff --git a/src/plugins/platforms/offscreen/qoffscreenwindow.cpp b/src/plugins/platforms/offscreen/qoffscreenwindow.cpp
index b009722e562..6f61d72ed31 100644
--- a/src/plugins/platforms/offscreen/qoffscreenwindow.cpp
+++ b/src/plugins/platforms/offscreen/qoffscreenwindow.cpp
@@ -168,6 +168,6 @@ QOffscreenWindow *QOffscreenWindow::windowForWinId(WId id)
     return m_windowForWinIdHash.value(id, 0);
 }
 
-QHash<WId, QOffscreenWindow *> QOffscreenWindow::m_windowForWinIdHash;
+Q_CONSTINIT QHash<WId, QOffscreenWindow *> QOffscreenWindow::m_windowForWinIdHash;
 
 QT_END_NAMESPACE