diff --git a/.cmake.conf b/.cmake.conf
index 0736c680fe..5fa772e243 100644
--- a/.cmake.conf
+++ b/.cmake.conf
@@ -4,3 +4,4 @@ set(QT_REPO_MODULE_PRERELEASE_VERSION_SEGMENT "alpha1")
 set(QT_EXTRA_INTERNAL_TARGET_DEFINES "QT_LEAN_HEADERS=1")
 list(APPEND QT_EXTRA_INTERNAL_TARGET_DEFINES "QT_NO_AS_CONST=1")
 list(APPEND QT_EXTRA_INTERNAL_TARGET_DEFINES "QT_NO_FOREACH=1")
+list(APPEND QT_EXTRA_INTERNAL_TARGET_DEFINES "QT_NO_QSNPRINTF=1")
diff --git a/src/3rdparty/masm/stubs/WTFStubs.cpp b/src/3rdparty/masm/stubs/WTFStubs.cpp
index f876cda032..66e0b455b9 100644
--- a/src/3rdparty/masm/stubs/WTFStubs.cpp
+++ b/src/3rdparty/masm/stubs/WTFStubs.cpp
@@ -1,11 +1,13 @@
 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 #include <config.h>
+
+#include <cstdio>
+
 #include <stdlib.h>
 #include <stdio.h>
 #include <stdarg.h>
 #include <qdebug.h>
-#include <qbytearray.h> // qvsnprintf
 #include <FilePrintStream.h>
 
 #if ENABLE(ASSEMBLER) && CPU(X86) && !OS(MAC_OS_X)
@@ -58,7 +60,7 @@ FilePrintStream& dataFile()
 void dataLogFV(const char* format, va_list args)
 {
     char buffer[1024];
-    qvsnprintf(buffer, sizeof(buffer), format, args);
+    std::vsnprintf(buffer, sizeof(buffer), format, args);
     qDebug().nospace().noquote() << buffer;
 }
 
@@ -67,7 +69,7 @@ void dataLogF(const char* format, ...)
     char buffer[1024];
     va_list args;
     va_start(args, format);
-    qvsnprintf(buffer, sizeof(buffer), format, args);
+    std::vsnprintf(buffer, sizeof(buffer), format, args);
     va_end(args);
     qDebug().nospace().noquote() << buffer;
 }
diff --git a/src/qml/jit/qv4assemblercommon.cpp b/src/qml/jit/qv4assemblercommon.cpp
index b18b4960b7..bedd4a78d0 100644
--- a/src/qml/jit/qv4assemblercommon.cpp
+++ b/src/qml/jit/qv4assemblercommon.cpp
@@ -15,6 +15,8 @@
 #include <assembler/LinkBuffer.h>
 #include <WTFStubs.h>
 
+#include <cstdio>
+
 #if QT_CONFIG(qml_jit)
 
 #undef ENABLE_ALL_ASSEMBLERS_FOR_REFACTORING_PURPOSES
@@ -44,7 +46,7 @@ public:
 
     void vprintf(const char* format, va_list argList) override WTF_ATTRIBUTE_PRINTF(2, 0)
     {
-        const int printed = qvsnprintf(buf.data(), buf.size(), format, argList);
+        const int printed = std::vsnprintf(buf.data(), buf.size(), format, argList);
         Q_ASSERT(printed <= buf.size());
 
         qint64 written = 0;