diff --git a/src/libs/solutions/tasking/barrier.cpp b/src/libs/solutions/tasking/barrier.cpp
index 74c11f50de5..650aae3403b 100644
--- a/src/libs/solutions/tasking/barrier.cpp
+++ b/src/libs/solutions/tasking/barrier.cpp
@@ -1,8 +1,11 @@
-// Copyright (C) 2023 The Qt Company Ltd.
+// Copyright (C) 2024 Jarek Kobus
+// Copyright (C) 2024 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
 
 #include "barrier.h"
 
+QT_BEGIN_NAMESPACE
+
 namespace Tasking {
 
 // That's cut down qtcassert.{c,h} to avoid the dependency.
@@ -47,3 +50,5 @@ void Barrier::stopWithResult(DoneResult result)
 }
 
 } // namespace Tasking
+
+QT_END_NAMESPACE
diff --git a/src/libs/solutions/tasking/barrier.h b/src/libs/solutions/tasking/barrier.h
index 88ef5f9a96e..a484844d38e 100644
--- a/src/libs/solutions/tasking/barrier.h
+++ b/src/libs/solutions/tasking/barrier.h
@@ -1,12 +1,16 @@
-// Copyright (C) 2023 The Qt Company Ltd.
+// Copyright (C) 2024 Jarek Kobus
+// Copyright (C) 2024 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
 
-#pragma once
+#ifndef TASKING_BARRIER_H
+#define TASKING_BARRIER_H
 
 #include "tasking_global.h"
 
 #include "tasktree.h"
 
+QT_BEGIN_NAMESPACE
+
 namespace Tasking {
 
 class TASKING_EXPORT Barrier final : public QObject
@@ -91,3 +95,7 @@ GroupItem waitForBarrierTask(const MultiBarrier<Limit> &sharedBarrier)
 }
 
 } // namespace Tasking
+
+QT_END_NAMESPACE
+
+#endif // TASKING_BARRIER_H
diff --git a/src/libs/solutions/tasking/concurrentcall.h b/src/libs/solutions/tasking/concurrentcall.h
index a3721fca0cf..ae1fcd17cd5 100644
--- a/src/libs/solutions/tasking/concurrentcall.h
+++ b/src/libs/solutions/tasking/concurrentcall.h
@@ -1,12 +1,16 @@
-// Copyright (C) 2023 The Qt Company Ltd.
+// Copyright (C) 2024 Jarek Kobus
+// Copyright (C) 2024 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
 
-#pragma once
+#ifndef TASKING_CONCURRENTCALL_H
+#define TASKING_CONCURRENTCALL_H
 
 #include "tasktree.h"
 
 #include <QtConcurrent/QtConcurrent>
 
+QT_BEGIN_NAMESPACE
+
 namespace Tasking {
 
 // This class introduces the dependency to Qt::Concurrent, otherwise Tasking namespace
@@ -98,3 +102,7 @@ template <typename T>
 using ConcurrentCallTask = CustomTask<ConcurrentCallTaskAdapter<T>>;
 
 } // namespace Tasking
+
+QT_END_NAMESPACE
+
+#endif // TASKING_CONCURRENTCALL_H
diff --git a/src/libs/solutions/tasking/networkquery.cpp b/src/libs/solutions/tasking/networkquery.cpp
index c3de4455eb6..30789ec925b 100644
--- a/src/libs/solutions/tasking/networkquery.cpp
+++ b/src/libs/solutions/tasking/networkquery.cpp
@@ -1,10 +1,13 @@
-// Copyright (C) 2023 The Qt Company Ltd.
+// Copyright (C) 2024 Jarek Kobus
+// Copyright (C) 2024 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
 #include "networkquery.h"
 
 #include <QtNetwork/QNetworkAccessManager>
 
+QT_BEGIN_NAMESPACE
+
 namespace Tasking {
 
 void NetworkQuery::start()
@@ -51,3 +54,5 @@ NetworkQuery::~NetworkQuery()
 }
 
 } // namespace Tasking
+
+QT_END_NAMESPACE
diff --git a/src/libs/solutions/tasking/networkquery.h b/src/libs/solutions/tasking/networkquery.h
index b8ad13bdfae..6d288486712 100644
--- a/src/libs/solutions/tasking/networkquery.h
+++ b/src/libs/solutions/tasking/networkquery.h
@@ -1,7 +1,9 @@
-// Copyright (C) 2023 The Qt Company Ltd.
+// Copyright (C) 2024 Jarek Kobus
+// Copyright (C) 2024 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
-#pragma once
+#ifndef TASKING_NETWORKQUERY_H
+#define TASKING_NETWORKQUERY_H
 
 #include "tasking_global.h"
 
@@ -14,7 +16,6 @@
 
 QT_BEGIN_NAMESPACE
 class QNetworkAccessManager;
-QT_END_NAMESPACE
 
 namespace Tasking {
 
@@ -59,3 +60,7 @@ public:
 using NetworkQueryTask = CustomTask<NetworkQueryTaskAdapter>;
 
 } // namespace Tasking
+
+QT_END_NAMESPACE
+
+#endif // TASKING_NETWORKQUERY_H
diff --git a/src/libs/solutions/tasking/qprocesstask.cpp b/src/libs/solutions/tasking/qprocesstask.cpp
index 70f9cc2ad8e..b0a61986a38 100644
--- a/src/libs/solutions/tasking/qprocesstask.cpp
+++ b/src/libs/solutions/tasking/qprocesstask.cpp
@@ -1,4 +1,5 @@
-// Copyright (C) 2023 The Qt Company Ltd.
+// Copyright (C) 2024 Jarek Kobus
+// Copyright (C) 2024 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
 #include "qprocesstask.h"
@@ -10,6 +11,10 @@
 #include <QtCore/QTimer>
 #include <QtCore/QWaitCondition>
 
+QT_BEGIN_NAMESPACE
+
+#if QT_CONFIG(process)
+
 namespace Tasking {
 
 class ProcessReaperPrivate;
@@ -262,4 +267,13 @@ void QProcessDeleter::operator()(QProcess *process)
 
 } // namespace Tasking
 
+#endif // QT_CONFIG(process)
+
+QT_END_NAMESPACE
+
+#if QT_CONFIG(process)
+
 #include "qprocesstask.moc"
+
+#endif // QT_CONFIG(process)
+
diff --git a/src/libs/solutions/tasking/qprocesstask.h b/src/libs/solutions/tasking/qprocesstask.h
index fb71d159aab..3b06e624fb5 100644
--- a/src/libs/solutions/tasking/qprocesstask.h
+++ b/src/libs/solutions/tasking/qprocesstask.h
@@ -1,7 +1,9 @@
-// Copyright (C) 2023 The Qt Company Ltd.
+// Copyright (C) 2024 Jarek Kobus
+// Copyright (C) 2024 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
 
-#pragma once
+#ifndef TASKING_QPROCESSTASK_H
+#define TASKING_QPROCESSTASK_H
 
 #include "tasking_global.h"
 
@@ -9,6 +11,10 @@
 
 #include <QtCore/QProcess>
 
+QT_BEGIN_NAMESPACE
+
+#if QT_CONFIG(process)
+
 namespace Tasking {
 
 // Deleting a running QProcess may block the caller thread up to 30 seconds and issue warnings.
@@ -64,3 +70,9 @@ private:
 using QProcessTask = CustomTask<QProcessAdapter>;
 
 } // namespace Tasking
+
+#endif // QT_CONFIG(process)
+
+QT_END_NAMESPACE
+
+#endif // TASKING_QPROCESSTASK_H
diff --git a/src/libs/solutions/tasking/tasking_global.h b/src/libs/solutions/tasking/tasking_global.h
index 9d9e183b9a3..024d7e33036 100644
--- a/src/libs/solutions/tasking/tasking_global.h
+++ b/src/libs/solutions/tasking/tasking_global.h
@@ -1,10 +1,13 @@
-// Copyright (C) 2023 The Qt Company Ltd.
+// Copyright (C) 2024 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
 
-#pragma once
+#ifndef TASKING_GLOBAL_H
+#define TASKING_GLOBAL_H
 
 #include <QtCore/qglobal.h>
 
+QT_BEGIN_NAMESPACE
+
 #if defined(TASKING_LIBRARY)
 #  define TASKING_EXPORT Q_DECL_EXPORT
 #elif defined(TASKING_STATIC_LIBRARY)
@@ -12,3 +15,7 @@
 #else
 #  define TASKING_EXPORT Q_DECL_IMPORT
 #endif
+
+QT_END_NAMESPACE
+
+#endif // TASKING_GLOBAL_H
diff --git a/src/libs/solutions/tasking/tasktree.cpp b/src/libs/solutions/tasking/tasktree.cpp
index c5a6ed6a70e..2c7a5a8dedb 100644
--- a/src/libs/solutions/tasking/tasktree.cpp
+++ b/src/libs/solutions/tasking/tasktree.cpp
@@ -1,4 +1,5 @@
-// Copyright (C) 2023 The Qt Company Ltd.
+// Copyright (C) 2024 Jarek Kobus
+// Copyright (C) 2024 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
 
 #include "tasktree.h"
@@ -19,6 +20,8 @@
 
 using namespace std::chrono;
 
+QT_BEGIN_NAMESPACE
+
 namespace Tasking {
 
 // That's cut down qtcassert.{c,h} to avoid the dependency.
@@ -3415,3 +3418,5 @@ void TimeoutTaskAdapter::start()
 */
 
 } // namespace Tasking
+
+QT_END_NAMESPACE
diff --git a/src/libs/solutions/tasking/tasktree.h b/src/libs/solutions/tasking/tasktree.h
index 06a3d4ea79c..caedb78c2c8 100644
--- a/src/libs/solutions/tasking/tasktree.h
+++ b/src/libs/solutions/tasking/tasktree.h
@@ -1,7 +1,9 @@
-// Copyright (C) 2023 The Qt Company Ltd.
+// Copyright (C) 2024 Jarek Kobus
+// Copyright (C) 2024 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
 
-#pragma once
+#ifndef TASKING_TASKTREE_H
+#define TASKING_TASKTREE_H
 
 #include "tasking_global.h"
 
@@ -13,7 +15,6 @@
 QT_BEGIN_NAMESPACE
 template <class T>
 class QFuture;
-QT_END_NAMESPACE
 
 namespace Tasking {
 
@@ -41,7 +42,7 @@ enum class WorkflowPolicy
     FinishAllAndSuccess,  // 4  - Reports success after all children finished.
     FinishAllAndError     // 5  - Reports error after all children finished.
 };
-Q_ENUM_NS(WorkflowPolicy);
+Q_ENUM_NS(WorkflowPolicy)
 
 enum class SetupResult
 {
@@ -49,14 +50,14 @@ enum class SetupResult
     StopWithSuccess,
     StopWithError
 };
-Q_ENUM_NS(SetupResult);
+Q_ENUM_NS(SetupResult)
 
 enum class DoneResult
 {
     Success,
     Error
 };
-Q_ENUM_NS(DoneResult);
+Q_ENUM_NS(DoneResult)
 
 enum class DoneWith
 {
@@ -64,7 +65,7 @@ enum class DoneWith
     Error,
     Cancel
 };
-Q_ENUM_NS(DoneWith);
+Q_ENUM_NS(DoneWith)
 
 enum class CallDoneIf
 {
@@ -72,7 +73,7 @@ enum class CallDoneIf
     Success,
     Error
 };
-Q_ENUM_NS(CallDoneIf);
+Q_ENUM_NS(CallDoneIf)
 
 TASKING_EXPORT DoneResult toDoneResult(bool success);
 
@@ -624,3 +625,7 @@ using TaskTreeTask = CustomTask<TaskTreeTaskAdapter>;
 using TimeoutTask = CustomTask<TimeoutTaskAdapter>;
 
 } // namespace Tasking
+
+QT_END_NAMESPACE
+
+#endif // TASKING_TASKTREE_H
diff --git a/src/libs/solutions/tasking/tasktreerunner.cpp b/src/libs/solutions/tasking/tasktreerunner.cpp
index 0f7e96db088..d0daa5daaed 100644
--- a/src/libs/solutions/tasking/tasktreerunner.cpp
+++ b/src/libs/solutions/tasking/tasktreerunner.cpp
@@ -1,3 +1,4 @@
+// Copyright (C) 2024 Jarek Kobus
 // Copyright (C) 2024 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
 
@@ -5,6 +6,8 @@
 
 #include "tasktree.h"
 
+QT_BEGIN_NAMESPACE
+
 namespace Tasking {
 
 TaskTreeRunner::~TaskTreeRunner() = default;
@@ -38,3 +41,5 @@ void TaskTreeRunner::reset()
 }
 
 } // namespace Tasking
+
+QT_END_NAMESPACE
diff --git a/src/libs/solutions/tasking/tasktreerunner.h b/src/libs/solutions/tasking/tasktreerunner.h
index 766ea074f50..ba41c0913fd 100644
--- a/src/libs/solutions/tasking/tasktreerunner.h
+++ b/src/libs/solutions/tasking/tasktreerunner.h
@@ -1,13 +1,17 @@
+// Copyright (C) 2024 Jarek Kobus
 // Copyright (C) 2024 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
 
-#pragma once
+#ifndef TASKING_TASKTREERUNNER_H
+#define TASKING_TASKTREERUNNER_H
 
 #include "tasking_global.h"
 #include "tasktree.h"
 
 #include <QtCore/QObject>
 
+QT_BEGIN_NAMESPACE
+
 namespace Tasking {
 
 class TASKING_EXPORT TaskTreeRunner : public QObject
@@ -42,3 +46,7 @@ private:
 };
 
 } // namespace Tasking
+
+QT_END_NAMESPACE
+
+#endif // TASKING_TASKTREERUNNER_H