diff --git a/modules/openapi-generator/src/main/resources/cpp-qt-client/HttpRequest.cpp.mustache b/modules/openapi-generator/src/main/resources/cpp-qt-client/HttpRequest.cpp.mustache
index b6469763e2b..e64476a579a 100644
--- a/modules/openapi-generator/src/main/resources/cpp-qt-client/HttpRequest.cpp.mustache
+++ b/modules/openapi-generator/src/main/resources/cpp-qt-client/HttpRequest.cpp.mustache
@@ -47,13 +47,7 @@ void {{prefix}}HttpRequestInput::add_file(QString variable_name, QString local_f
 
 {{prefix}}HttpRequestWorker::{{prefix}}HttpRequestWorker(QObject *parent, QNetworkAccessManager *_manager)
     : QObject(parent), manager(_manager), timeOutTimer(this), isResponseCompressionEnabled(false), isRequestCompressionEnabled(false), httpResponseCode(-1) {
-
-#if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
     randomGenerator = QRandomGenerator(QDateTime::currentDateTime().toSecsSinceEpoch());
-#else
-    qsrand(QDateTime::currentDateTime().toTime_t());
-#endif
-
     if (manager == nullptr) {
         manager = new QNetworkAccessManager(this);
     }
@@ -212,13 +206,8 @@ void {{prefix}}HttpRequestWorker::execute({{prefix}}HttpRequestInput *input) {
         // variable layout is MULTIPART
 
         boundary = QString("__-----------------------%1%2")
-                    #if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
                             .arg(QDateTime::currentDateTime().toSecsSinceEpoch())
                             .arg(randomGenerator.generate());
-                    #else
-                            .arg(QDateTime::currentDateTime().toTime_t())
-                            .arg(qrand());
-                    #endif
         QString boundary_delimiter = "--";
         QString new_line = "\r\n";
 
@@ -359,16 +348,7 @@ void {{prefix}}HttpRequestWorker::execute({{prefix}}HttpRequestInput *input) {
     } else if (input->http_method == "DELETE") {
         reply = manager->deleteResource(request);
     } else {
-#if (QT_VERSION >= 0x050800)
         reply = manager->sendCustomRequest(request, input->http_method.toLatin1(), request_content);
-#else
-        QBuffer *buffer = new QBuffer;
-        buffer->setData(request_content);
-        buffer->open(QIODevice::ReadOnly);
-
-        reply = manager->sendCustomRequest(request, input->http_method.toLatin1(), buffer);
-        buffer->setParent(reply);
-#endif
     }
     if (reply != nullptr) {
         reply->setParent(this);
diff --git a/samples/client/petstore/cpp-qt-addDownloadProgress/client/PFXHttpRequest.cpp b/samples/client/petstore/cpp-qt-addDownloadProgress/client/PFXHttpRequest.cpp
index 4e36e7a596f..0e05affef6b 100644
--- a/samples/client/petstore/cpp-qt-addDownloadProgress/client/PFXHttpRequest.cpp
+++ b/samples/client/petstore/cpp-qt-addDownloadProgress/client/PFXHttpRequest.cpp
@@ -54,13 +54,7 @@ void PFXHttpRequestInput::add_file(QString variable_name, QString local_filename
 
 PFXHttpRequestWorker::PFXHttpRequestWorker(QObject *parent, QNetworkAccessManager *_manager)
     : QObject(parent), manager(_manager), timeOutTimer(this), isResponseCompressionEnabled(false), isRequestCompressionEnabled(false), httpResponseCode(-1) {
-
-#if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
     randomGenerator = QRandomGenerator(QDateTime::currentDateTime().toSecsSinceEpoch());
-#else
-    qsrand(QDateTime::currentDateTime().toTime_t());
-#endif
-
     if (manager == nullptr) {
         manager = new QNetworkAccessManager(this);
     }
@@ -219,13 +213,8 @@ void PFXHttpRequestWorker::execute(PFXHttpRequestInput *input) {
         // variable layout is MULTIPART
 
         boundary = QString("__-----------------------%1%2")
-                    #if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
                             .arg(QDateTime::currentDateTime().toSecsSinceEpoch())
                             .arg(randomGenerator.generate());
-                    #else
-                            .arg(QDateTime::currentDateTime().toTime_t())
-                            .arg(qrand());
-                    #endif
         QString boundary_delimiter = "--";
         QString new_line = "\r\n";
 
@@ -366,16 +355,7 @@ void PFXHttpRequestWorker::execute(PFXHttpRequestInput *input) {
     } else if (input->http_method == "DELETE") {
         reply = manager->deleteResource(request);
     } else {
-#if (QT_VERSION >= 0x050800)
         reply = manager->sendCustomRequest(request, input->http_method.toLatin1(), request_content);
-#else
-        QBuffer *buffer = new QBuffer;
-        buffer->setData(request_content);
-        buffer->open(QIODevice::ReadOnly);
-
-        reply = manager->sendCustomRequest(request, input->http_method.toLatin1(), buffer);
-        buffer->setParent(reply);
-#endif
     }
     if (reply != nullptr) {
         reply->setParent(this);
diff --git a/samples/client/petstore/cpp-qt/client/PFXHttpRequest.cpp b/samples/client/petstore/cpp-qt/client/PFXHttpRequest.cpp
index 4e36e7a596f..0e05affef6b 100644
--- a/samples/client/petstore/cpp-qt/client/PFXHttpRequest.cpp
+++ b/samples/client/petstore/cpp-qt/client/PFXHttpRequest.cpp
@@ -54,13 +54,7 @@ void PFXHttpRequestInput::add_file(QString variable_name, QString local_filename
 
 PFXHttpRequestWorker::PFXHttpRequestWorker(QObject *parent, QNetworkAccessManager *_manager)
     : QObject(parent), manager(_manager), timeOutTimer(this), isResponseCompressionEnabled(false), isRequestCompressionEnabled(false), httpResponseCode(-1) {
-
-#if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
     randomGenerator = QRandomGenerator(QDateTime::currentDateTime().toSecsSinceEpoch());
-#else
-    qsrand(QDateTime::currentDateTime().toTime_t());
-#endif
-
     if (manager == nullptr) {
         manager = new QNetworkAccessManager(this);
     }
@@ -219,13 +213,8 @@ void PFXHttpRequestWorker::execute(PFXHttpRequestInput *input) {
         // variable layout is MULTIPART
 
         boundary = QString("__-----------------------%1%2")
-                    #if QT_VERSION >= QT_VERSION_CHECK(5, 15, 0)
                             .arg(QDateTime::currentDateTime().toSecsSinceEpoch())
                             .arg(randomGenerator.generate());
-                    #else
-                            .arg(QDateTime::currentDateTime().toTime_t())
-                            .arg(qrand());
-                    #endif
         QString boundary_delimiter = "--";
         QString new_line = "\r\n";
 
@@ -366,16 +355,7 @@ void PFXHttpRequestWorker::execute(PFXHttpRequestInput *input) {
     } else if (input->http_method == "DELETE") {
         reply = manager->deleteResource(request);
     } else {
-#if (QT_VERSION >= 0x050800)
         reply = manager->sendCustomRequest(request, input->http_method.toLatin1(), request_content);
-#else
-        QBuffer *buffer = new QBuffer;
-        buffer->setData(request_content);
-        buffer->open(QIODevice::ReadOnly);
-
-        reply = manager->sendCustomRequest(request, input->http_method.toLatin1(), buffer);
-        buffer->setParent(reply);
-#endif
     }
     if (reply != nullptr) {
         reply->setParent(this);