diff --git a/src/gui/CMakeLists.txt b/src/gui/CMakeLists.txt
index 3b3dbd1321..124e2bfa29 100644
--- a/src/gui/CMakeLists.txt
+++ b/src/gui/CMakeLists.txt
@@ -275,6 +275,7 @@ qt_internal_add_module(Gui
         QT_NO_CONTEXTLESS_CONNECT
         QT_NO_FOREACH
         QT_NO_USING_NAMESPACE
+        QT_NO_QSNPRINTF
         QT_USE_NODISCARD_FILE_OPEN
         QT_QPA_DEFAULT_PLATFORM_NAME="${QT_QPA_DEFAULT_PLATFORM}"
     INCLUDE_DIRECTORIES
diff --git a/src/gui/image/qxbmhandler.cpp b/src/gui/image/qxbmhandler.cpp
index 5b7792fb51..b7e2e7071b 100644
--- a/src/gui/image/qxbmhandler.cpp
+++ b/src/gui/image/qxbmhandler.cpp
@@ -12,6 +12,8 @@
 #include <qvariant.h>
 #include <private/qtools_p.h>
 
+#include <cstdio>
+
 #include <stdio.h>
 
 QT_BEGIN_NAMESPACE
@@ -167,11 +169,11 @@ static bool write_xbm_image(const QImage &sourceImage, QIODevice *device, const
     const auto msize = s.size() + 100;
     char *buf = new char[msize];
 
-    qsnprintf(buf, msize, "#define %s_width %d\n", s.data(), w);
+    std::snprintf(buf, msize, "#define %s_width %d\n", s.data(), w);
     device->write(buf, qstrlen(buf));
-    qsnprintf(buf, msize, "#define %s_height %d\n", s.data(), h);
+    std::snprintf(buf, msize, "#define %s_height %d\n", s.data(), h);
     device->write(buf, qstrlen(buf));
-    qsnprintf(buf, msize, "static char %s_bits[] = {\n ", s.data());
+    std::snprintf(buf, msize, "static char %s_bits[] = {\n ", s.data());
     device->write(buf, qstrlen(buf));
 
     if (image.format() != QImage::Format_MonoLSB)
diff --git a/src/gui/painting/qpdf.cpp b/src/gui/painting/qpdf.cpp
index 680f30c852..285d2e3f4a 100644
--- a/src/gui/painting/qpdf.cpp
+++ b/src/gui/painting/qpdf.cpp
@@ -24,6 +24,7 @@
 #include <quuid.h>
 #include <qxmlstream.h>
 
+#include <cstdio>
 #include <map>
 
 #ifndef QT_NO_COMPRESS
@@ -1750,30 +1751,30 @@ void QPdfEnginePrivate::writeInfo(const QDateTime &date)
     constexpr size_t formattedDateSize = 26;
     char formattedDate[formattedDateSize];
     const int year = qBound(0, d.year(), 9999); // ASN.1, max 4 digits
-    auto printedSize = qsnprintf(formattedDate,
-                                 formattedDateSize,
-                                 "(D:%04d%02d%02d%02d%02d%02d",
-                                 year,
-                                 d.month(),
-                                 d.day(),
-                                 t.hour(),
-                                 t.minute(),
-                                 t.second());
+    auto printedSize = std::snprintf(formattedDate,
+                                     formattedDateSize,
+                                     "(D:%04d%02d%02d%02d%02d%02d",
+                                     year,
+                                     d.month(),
+                                     d.day(),
+                                     t.hour(),
+                                     t.minute(),
+                                     t.second());
     const int offset = date.offsetFromUtc();
     const int hours  = (offset / 60) / 60;
     const int mins   = (offset / 60) % 60;
     if (offset < 0) {
-        qsnprintf(formattedDate + printedSize,
-                  formattedDateSize - printedSize,
-                  "-%02d'%02d')", -hours, -mins);
+        std::snprintf(formattedDate + printedSize,
+                      formattedDateSize - printedSize,
+                      "-%02d'%02d')", -hours, -mins);
     } else if (offset > 0) {
-        qsnprintf(formattedDate + printedSize,
-                  formattedDateSize - printedSize,
-                  "+%02d'%02d')", hours, mins);
+        std::snprintf(formattedDate + printedSize,
+                      formattedDateSize - printedSize,
+                      "+%02d'%02d')", hours, mins);
     } else {
-        qsnprintf(formattedDate + printedSize,
-                  formattedDateSize - printedSize,
-                  "Z)");
+        std::snprintf(formattedDate + printedSize,
+                      formattedDateSize - printedSize,
+                      "Z)");
     }
 
     write("\n/CreationDate ");
@@ -2472,7 +2473,7 @@ void QPdfEnginePrivate::xprintf(const char* fmt, ...)
 
     va_list args;
     va_start(args, fmt);
-    int bufsize = qvsnprintf(buf, msize, fmt, args);
+    int bufsize = std::vsnprintf(buf, msize, fmt, args);
     va_end(args);
 
     if (Q_LIKELY(bufsize < msize)) {
@@ -2481,7 +2482,7 @@ void QPdfEnginePrivate::xprintf(const char* fmt, ...)
         // Fallback for abnormal cases
         QScopedArrayPointer<char> tmpbuf(new char[bufsize + 1]);
         va_start(args, fmt);
-        bufsize = qvsnprintf(tmpbuf.data(), bufsize + 1, fmt, args);
+        bufsize = std::vsnprintf(tmpbuf.data(), bufsize + 1, fmt, args);
         va_end(args);
         stream->writeRawData(tmpbuf.data(), bufsize);
     }
diff --git a/src/gui/rhi/qrhid3d11.cpp b/src/gui/rhi/qrhid3d11.cpp
index 7fc2976d76..ba9104fe72 100644
--- a/src/gui/rhi/qrhid3d11.cpp
+++ b/src/gui/rhi/qrhid3d11.cpp
@@ -10,6 +10,8 @@
 #include <QtCore/private/qsystemerror_p.h>
 #include "qrhid3dhelpers_p.h"
 
+#include <cstdio>
+
 QT_BEGIN_NAMESPACE
 
 using namespace Qt::StringLiterals;
@@ -4697,7 +4699,7 @@ bool QD3D11GraphicsPipeline::create()
             } else {
                 QByteArray sem;
                 sem.resize(16);
-                qsnprintf(sem.data(), sem.size(), "TEXCOORD%d_", it->location() - matrixSlice);
+                std::snprintf(sem.data(), sem.size(), "TEXCOORD%d_", it->location() - matrixSlice);
                 matrixSliceSemantics.append(sem);
                 desc.SemanticName = matrixSliceSemantics.last().constData();
                 desc.SemanticIndex = UINT(matrixSlice);
diff --git a/src/gui/rhi/qrhid3d12.cpp b/src/gui/rhi/qrhid3d12.cpp
index 2a178fbb9a..87746d4d3c 100644
--- a/src/gui/rhi/qrhid3d12.cpp
+++ b/src/gui/rhi/qrhid3d12.cpp
@@ -5703,7 +5703,7 @@ bool QD3D12GraphicsPipeline::create()
             } else {
                 QByteArray sem;
                 sem.resize(16);
-                qsnprintf(sem.data(), sem.size(), "TEXCOORD%d_", it->location() - matrixSlice);
+                std::snprintf(sem.data(), sem.size(), "TEXCOORD%d_", it->location() - matrixSlice);
                 matrixSliceSemantics.append(sem);
                 desc.SemanticName = matrixSliceSemantics.last().constData();
                 desc.SemanticIndex = UINT(matrixSlice);