diff --git a/src/corelib/kernel/qcore_mac_p.h b/src/corelib/kernel/qcore_mac_p.h
index 3266dc10a8..270b8fcf0f 100644
--- a/src/corelib/kernel/qcore_mac_p.h
+++ b/src/corelib/kernel/qcore_mac_p.h
@@ -168,7 +168,7 @@ Q_CORE_EXPORT bool qt_mac_applicationIsInDarkMode();
 #endif
 
 #ifndef QT_NO_DEBUG_STREAM
-QDebug operator<<(QDebug debug, const QMacAutoReleasePool *pool);
+Q_CORE_EXPORT QDebug operator<<(QDebug debug, const QMacAutoReleasePool *pool);
 #endif
 
 Q_CORE_EXPORT bool qt_apple_isApplicationExtension();