diff --git a/src/corelib/thread/qatomic.h b/src/corelib/thread/qatomic.h
index 24f2616e82..7fe5ac69b9 100644
--- a/src/corelib/thread/qatomic.h
+++ b/src/corelib/thread/qatomic.h
@@ -2,8 +2,6 @@
 // Copyright (C) 2016 Intel Corporation.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#include <QtCore/qglobal.h>
-
 #ifndef QATOMIC_H
 #define QATOMIC_H
 
diff --git a/src/corelib/thread/qbasicatomic.h b/src/corelib/thread/qbasicatomic.h
index d03c270ed6..e3fbe55890 100644
--- a/src/corelib/thread/qbasicatomic.h
+++ b/src/corelib/thread/qbasicatomic.h
@@ -2,8 +2,6 @@
 // Copyright (C) 2018 Intel Corporation.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
-#include <QtCore/qglobal.h>
-
 #ifndef QBASICATOMIC_H
 #define QBASICATOMIC_H
 
diff --git a/src/corelib/thread/qgenericatomic.h b/src/corelib/thread/qgenericatomic.h
index b8a022a2ac..0e4a8a7562 100644
--- a/src/corelib/thread/qgenericatomic.h
+++ b/src/corelib/thread/qgenericatomic.h
@@ -5,7 +5,6 @@
 #ifndef QGENERICATOMIC_H
 #define QGENERICATOMIC_H
 
-#include <QtCore/qglobal.h>
 #include <QtCore/qtypeinfo.h>
 
 QT_BEGIN_NAMESPACE
diff --git a/src/corelib/tools/qcontiguouscache.cpp b/src/corelib/tools/qcontiguouscache.cpp
index 73cfed97f2..d28d1e7153 100644
--- a/src/corelib/tools/qcontiguouscache.cpp
+++ b/src/corelib/tools/qcontiguouscache.cpp
@@ -6,6 +6,8 @@
 #include <QDebug>
 #endif
 
+#include <QtCore/qmalloc.h>
+
 QT_BEGIN_NAMESPACE
 
 #ifdef QT_QCONTIGUOUSCACHE_DEBUG
diff --git a/src/corelib/tools/qcontiguouscache.h b/src/corelib/tools/qcontiguouscache.h
index 98fa82fda9..7b167292a8 100644
--- a/src/corelib/tools/qcontiguouscache.h
+++ b/src/corelib/tools/qcontiguouscache.h
@@ -5,7 +5,12 @@
 #define QCONTIGUOUSCACHE_H
 
 #include <QtCore/qatomic.h>
-#include <limits.h>
+#include <QtCore/qassert.h>
+#include <QtCore/qtclasshelpermacros.h>
+#include <QtCore/qtcoreexports.h>
+
+#include <climits>
+#include <limits>
 #include <new>
 
 QT_BEGIN_NAMESPACE