diff --git a/plugins/advancedviewplugin/advancedviewdialog.cpp b/plugins/advancedviewplugin/advancedviewdialog.cpp
index e25f390..c258ae4 100644
--- a/plugins/advancedviewplugin/advancedviewdialog.cpp
+++ b/plugins/advancedviewplugin/advancedviewdialog.cpp
@@ -29,7 +29,12 @@ AdvancedViewDialog::AdvancedViewDialog(StripsWidget &stripsWidget) :
     m_timeAssignmentsModel(new TimeAssignmentsModel(stripsWidget, this))
 {
     ui->setupUi(this);
+
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 9, 0))
     setWindowFlag(Qt::WindowContextHelpButtonHint, false);
+#else
+    setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
+#endif
 
     ui->bookingsView->setModel(m_bookingsModel);
     ui->bookingsView->setEnabled(m_bookingsModel->enabled());
diff --git a/plugins/advancedviewplugin/dialogs/bookingdialog.cpp b/plugins/advancedviewplugin/dialogs/bookingdialog.cpp
index 0ebcb31..556839f 100644
--- a/plugins/advancedviewplugin/dialogs/bookingdialog.cpp
+++ b/plugins/advancedviewplugin/dialogs/bookingdialog.cpp
@@ -6,7 +6,12 @@ BookingDialog::BookingDialog(QWidget *parent) :
     ui(new Ui::BookingDialog)
 {
     ui->setupUi(this);
+
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 9, 0))
     setWindowFlag(Qt::WindowContextHelpButtonHint, false);
+#else
+    setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
+#endif
 }
 
 BookingDialog::~BookingDialog()
diff --git a/plugins/advancedviewplugin/dialogs/timeassignmentdialog.cpp b/plugins/advancedviewplugin/dialogs/timeassignmentdialog.cpp
index 894430c..575d2ca 100644
--- a/plugins/advancedviewplugin/dialogs/timeassignmentdialog.cpp
+++ b/plugins/advancedviewplugin/dialogs/timeassignmentdialog.cpp
@@ -13,7 +13,12 @@ TimeAssignmentDialog::TimeAssignmentDialog(const QMap<QString, QString> &project
     ui(new Ui::TimeAssignmentDialog)
 {
     ui->setupUi(this);
+
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 9, 0))
     setWindowFlag(Qt::WindowContextHelpButtonHint, false);
+#else
+    setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
+#endif
 
     {
         for(const auto &preferedProject : settings.projects())
diff --git a/plugins/devtoolsplugin/logdialog.cpp b/plugins/devtoolsplugin/logdialog.cpp
index 0780c99..f401579 100644
--- a/plugins/devtoolsplugin/logdialog.cpp
+++ b/plugins/devtoolsplugin/logdialog.cpp
@@ -6,7 +6,12 @@ LogDialog::LogDialog(QWidget *parent) :
     ui(new Ui::LogDialog)
 {
     ui->setupUi(this);
+
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 9, 0))
     setWindowFlag(Qt::WindowContextHelpButtonHint, false);
+#else
+    setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
+#endif
 }
 
 LogDialog::~LogDialog()
diff --git a/plugins/lunchmealplugin/lunchmealdialog.cpp b/plugins/lunchmealplugin/lunchmealdialog.cpp
index 6627216..0693f31 100644
--- a/plugins/lunchmealplugin/lunchmealdialog.cpp
+++ b/plugins/lunchmealplugin/lunchmealdialog.cpp
@@ -16,7 +16,12 @@ LunchMealDialog::LunchMealDialog(StripsWidget &stripsWidget) :
     ui(new Ui::LunchMealDialog)
 {
     ui->setupUi(this);
+
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 9, 0))
     setWindowFlag(Qt::WindowContextHelpButtonHint, false);
+#else
+    setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
+#endif
 
     ui->labelTitle->setText(tr("Lunch meal for %0").arg(stripsWidget.date().toString(tr("dd.MM.yyyy"))));
 
diff --git a/plugins/profileplugin/profiledialog.cpp b/plugins/profileplugin/profiledialog.cpp
index 6db4220..fae2c94 100644
--- a/plugins/profileplugin/profiledialog.cpp
+++ b/plugins/profileplugin/profiledialog.cpp
@@ -6,7 +6,12 @@ ProfileDialog::ProfileDialog(const GetUserInfoReply::UserInfo &userInfo, QWidget
     ui(new Ui::ProfileDialog)
 {
     ui->setupUi(this);
+
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 9, 0))
     setWindowFlag(Qt::WindowContextHelpButtonHint, false);
+#else
+    setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
+#endif
 
     ui->spinBoxUserId->setValue(userInfo.userId);
     ui->lineEditEmail->setText(userInfo.email);
diff --git a/plugins/updaterplugin/updaterdialog.cpp b/plugins/updaterplugin/updaterdialog.cpp
index 32781e2..b890a90 100644
--- a/plugins/updaterplugin/updaterdialog.cpp
+++ b/plugins/updaterplugin/updaterdialog.cpp
@@ -24,7 +24,12 @@ UpdaterDialog::UpdaterDialog(MainWindow &mainWindow) :
     m_mainWindow(mainWindow)
 {
     ui->setupUi(this);
+
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 9, 0))
     setWindowFlag(Qt::WindowContextHelpButtonHint, false);
+#else
+    setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
+#endif
 
     setAttribute(Qt::WA_DeleteOnClose);
 
diff --git a/plugins/webradioplugin/webradiodialog.cpp b/plugins/webradioplugin/webradiodialog.cpp
index 68b64cb..49d7ce3 100644
--- a/plugins/webradioplugin/webradiodialog.cpp
+++ b/plugins/webradioplugin/webradiodialog.cpp
@@ -11,7 +11,12 @@ WebRadioDialog::WebRadioDialog(MainWindow &mainWindow) :
     m_player(new QMediaPlayer(this))
 {
     ui->setupUi(this);
+
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 9, 0))
     setWindowFlag(Qt::WindowContextHelpButtonHint, false);
+#else
+    setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
+#endif
 
     connect(m_player, &QMediaPlayer::stateChanged, this, &WebRadioDialog::stateChanged);
     connect(m_player, &QMediaPlayer::stateChanged, this, &WebRadioDialog::updateWidgets);
diff --git a/zeiterfassungguilib/dialogs/authenticationdialog.cpp b/zeiterfassungguilib/dialogs/authenticationdialog.cpp
index 72b68c6..d705e31 100644
--- a/zeiterfassungguilib/dialogs/authenticationdialog.cpp
+++ b/zeiterfassungguilib/dialogs/authenticationdialog.cpp
@@ -6,7 +6,12 @@ AuthenticationDialog::AuthenticationDialog(QWidget *parent) :
     ui(new Ui::AuthenticationDialog)
 {
     ui->setupUi(this);
+
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 9, 0))
     setWindowFlag(Qt::WindowContextHelpButtonHint, false);
+#else
+    setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
+#endif
 }
 
 AuthenticationDialog::~AuthenticationDialog()
diff --git a/zeiterfassungguilib/dialogs/languageselectiondialog.cpp b/zeiterfassungguilib/dialogs/languageselectiondialog.cpp
index ae5195c..86a3e6b 100644
--- a/zeiterfassungguilib/dialogs/languageselectiondialog.cpp
+++ b/zeiterfassungguilib/dialogs/languageselectiondialog.cpp
@@ -6,7 +6,12 @@ LanguageSelectionDialog::LanguageSelectionDialog(QWidget *parent) :
     ui(new Ui::LanguageSelectionDialog)
 {
     ui->setupUi(this);
+
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 9, 0))
     setWindowFlag(Qt::WindowContextHelpButtonHint, false);
+#else
+    setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
+#endif
 
     ui->comboBoxLanguage->addItem(tr("English"), QLocale::English);
     ui->comboBoxLanguage->addItem(tr("German"), QLocale::German);
diff --git a/zeiterfassungguilib/dialogs/settingsdialog.cpp b/zeiterfassungguilib/dialogs/settingsdialog.cpp
index c00ec0e..f9e5c66 100644
--- a/zeiterfassungguilib/dialogs/settingsdialog.cpp
+++ b/zeiterfassungguilib/dialogs/settingsdialog.cpp
@@ -16,7 +16,12 @@ SettingsDialog::SettingsDialog(ZeiterfassungSettings &settings, QWidget *parent)
     m_settings(settings)
 {
     ui->setupUi(this);
+
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 9, 0))
     setWindowFlag(Qt::WindowContextHelpButtonHint, false);
+#else
+    setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);
+#endif
 
     ui->comboBoxLanguage->addItem(tr("English"), QLocale::English);
     ui->comboBoxLanguage->addItem(tr("German"), QLocale::German);