diff --git a/src/corelib/kernel/qsingleshottimer.cpp b/src/corelib/kernel/qsingleshottimer.cpp
index ee2b2dc3807..aafb5960776 100644
--- a/src/corelib/kernel/qsingleshottimer.cpp
+++ b/src/corelib/kernel/qsingleshottimer.cpp
@@ -4,13 +4,10 @@
 
 #include <QtCore/private/qsingleshottimer_p.h>
 
-#include "qabstracteventdispatcher.h"
 #include "qcoreapplication.h"
 #include "qmetaobject_p.h"
 #include "private/qnumeric_p.h"
 
-#include <chrono>
-
 QT_BEGIN_NAMESPACE
 
 QSingleShotTimer::QSingleShotTimer(Duration interval, Qt::TimerType timerType,
diff --git a/src/corelib/kernel/qsingleshottimer_p.h b/src/corelib/kernel/qsingleshottimer_p.h
index 800936a30de..9a7ad2ed298 100644
--- a/src/corelib/kernel/qsingleshottimer_p.h
+++ b/src/corelib/kernel/qsingleshottimer_p.h
@@ -16,12 +16,16 @@
 // We mean it.
 //
 
-#include "qabstracteventdispatcher.h"
-#include "qcoreapplication.h"
-#include "qmetaobject_p.h"
+#include <QtCore/qobject.h>
+#include <QtCore/qabstracteventdispatcher.h>
+#include <QtCore/qnamespace.h>
 
 QT_BEGIN_NAMESPACE
 
+namespace QtPrivate {
+class QSlotObjectBase;
+}
+
 class QSingleShotTimer : public QObject
 {
     Q_OBJECT