diff --git a/src/libs/utils/asynctask.h b/src/libs/utils/asynctask.h
index e035977401b..1a6ae7d1b6a 100644
--- a/src/libs/utils/asynctask.h
+++ b/src/libs/utils/asynctask.h
@@ -44,13 +44,11 @@ public:
     void setAsyncCallData(const Function &function, const Args &...args)
     {
         m_startHandler = [=] {
-            return Internal::runAsync_internal(m_threadPool, m_stackSize, m_priority,
-                                               function, args...);
+            return Utils::runAsync(m_threadPool, m_priority, function, args...);
         };
     }
     void setFutureSynchronizer(FutureSynchronizer *synchorizer) { m_synchronizer = synchorizer; }
     void setThreadPool(QThreadPool *pool) { m_threadPool = pool; }
-    void setStackSizeInBytes(const StackSizeInBytes &size) { m_stackSize = size; }
     void setPriority(QThread::Priority priority) { m_priority = priority; }
 
     void start()
@@ -75,7 +73,6 @@ private:
     FutureSynchronizer *m_synchronizer = nullptr;
     QThreadPool *m_threadPool = nullptr;
     QThread::Priority m_priority = QThread::InheritPriority;
-    StackSizeInBytes m_stackSize = {};
     QFutureWatcher<ResultType> m_watcher;
 };
 
diff --git a/src/libs/utils/runextensions.h b/src/libs/utils/runextensions.h
index 7c7e6a8e87d..f81eb56699c 100644
--- a/src/libs/utils/runextensions.h
+++ b/src/libs/utils/runextensions.h
@@ -16,7 +16,6 @@
 #include <QThreadPool>
 
 #include <functional>
-#include <optional>
 
 // hasCallOperator & Co must be outside of any namespace
 // because of internal compiler error with MSVC2015 Update 2
@@ -38,8 +37,6 @@ struct hasCallOperator
 
 namespace Utils {
 
-using StackSizeInBytes = std::optional<uint>;
-
 namespace Internal {
 
 /*
@@ -375,12 +372,10 @@ template<typename Function,
          typename... Args,
          typename ResultType = typename Internal::resultType<Function>::type>
 QFuture<ResultType> runAsync_internal(QThreadPool *pool,
-                                      StackSizeInBytes stackSize,
                                       QThread::Priority priority,
                                       Function &&function,
                                       Args &&... args)
 {
-    Q_ASSERT(!(pool && stackSize)); // stack size cannot be changed once a thread is started
     auto job = new Internal::AsyncJob<ResultType,Function,Args...>
             (std::forward<Function>(function), std::forward<Args>(args)...);
     job->setThreadPriority(priority);
@@ -390,8 +385,6 @@ QFuture<ResultType> runAsync_internal(QThreadPool *pool,
         pool->start(job);
     } else {
         auto thread = new Internal::RunnableThread(job);
-        if (stackSize)
-            thread->setStackSize(stackSize.value());
         thread->moveToThread(qApp->thread()); // make sure thread gets deleteLater on main thread
         QObject::connect(thread, &QThread::finished, thread, &QObject::deleteLater);
         thread->start(priority);
@@ -430,7 +423,6 @@ QFuture<ResultType>
 runAsync(QThreadPool *pool, QThread::Priority priority, Function &&function, Args&&... args)
 {
     return Internal::runAsync_internal(pool,
-                                       StackSizeInBytes(),
                                        priority,
                                        std::forward<Function>(function),
                                        std::forward<Args>(args)...);
@@ -450,47 +442,6 @@ runAsync(QThread::Priority priority, Function &&function, Args&&... args)
                     std::forward<Function>(function), std::forward<Args>(args)...);
 }
 
-/*!
-    Runs \a function with \a args in a new thread with given thread \a stackSize and
-    thread priority QThread::InheritPriority .
-    \sa runAsync(QThreadPool*,QThread::Priority,Function&&,Args&&...)
-    \sa QThread::Priority
-    \sa QThread::setStackSize
-*/
-template<typename Function,
-         typename... Args,
-         typename ResultType = typename Internal::resultType<Function>::type>
-QFuture<ResultType> runAsync(StackSizeInBytes stackSize, Function &&function, Args &&... args)
-{
-    return Internal::runAsync_internal(static_cast<QThreadPool *>(nullptr),
-                                       stackSize,
-                                       QThread::InheritPriority,
-                                       std::forward<Function>(function),
-                                       std::forward<Args>(args)...);
-}
-
-/*!
-    Runs \a function with \a args in a new thread with given thread \a stackSize and
-    given thread \a priority.
-    \sa runAsync(QThreadPool*,QThread::Priority,Function&&,Args&&...)
-    \sa QThread::Priority
-    \sa QThread::setStackSize
-*/
-template<typename Function,
-         typename... Args,
-         typename ResultType = typename Internal::resultType<Function>::type>
-QFuture<ResultType> runAsync(StackSizeInBytes stackSize,
-                             QThread::Priority priority,
-                             Function &&function,
-                             Args &&... args)
-{
-    return Internal::runAsync_internal(static_cast<QThreadPool *>(nullptr),
-                                       stackSize,
-                                       priority,
-                                       std::forward<Function>(function),
-                                       std::forward<Args>(args)...);
-}
-
 /*!
     Runs \a function with \a args in a new thread with thread priority QThread::InheritPriority.
     \sa runAsync(QThreadPool*,QThread::Priority,Function&&,Args&&...)
diff --git a/tests/auto/runextensions/tst_runextensions.cpp b/tests/auto/runextensions/tst_runextensions.cpp
index 2ddea333302..50a3f8a40d6 100644
--- a/tests/auto/runextensions/tst_runextensions.cpp
+++ b/tests/auto/runextensions/tst_runextensions.cpp
@@ -20,8 +20,6 @@ private slots:
     void moveOnlyType();
 #endif
     void threadPriority();
-    void threadSize();
-    void threadSizeAndPriority();
     void runAsyncNoFutureInterface();
     void crefFunction();
     void onResultReady();
@@ -379,19 +377,6 @@ void tst_RunExtensions::threadPriority()
              QList<int>({0, 2, 1}));
 }
 
-void tst_RunExtensions::threadSize()
-{
-    QCOMPARE(Utils::runAsync(Utils::StackSizeInBytes(1024 * 1024), report3).results(),
-             QList<int>({0, 2, 1}));
-}
-
-void tst_RunExtensions::threadSizeAndPriority()
-{
-    QCOMPARE(Utils::runAsync(Utils::StackSizeInBytes(1024 * 1024), QThread::LowestPriority, report3)
-                 .results(),
-             QList<int>({0, 2, 1}));
-}
-
 void tst_RunExtensions::runAsyncNoFutureInterface()
 {
     // free function pointer