diff --git a/src/corelib/io/qdebug.cpp b/src/corelib/io/qdebug.cpp
index 1c6ffa57c3c..0afbb374fae 100644
--- a/src/corelib/io/qdebug.cpp
+++ b/src/corelib/io/qdebug.cpp
@@ -320,7 +320,7 @@ void QDebug::putString(const QChar *begin, size_t length)
     if (stream->noQuotes) {
         // no quotes, write the string directly too (no pretty-printing)
         // this respects the QTextStream state, though
-        stream->ts.d_ptr->putString(begin, int(length));
+        stream->ts.d_ptr->putString(begin, qsizetype(length));
     } else {
         // we'll reset the QTextStream formatting mechanisms, so save the state
         QDebugStateSaver saver(*this);
@@ -338,7 +338,8 @@ void QDebug::putByteArray(const char *begin, size_t length, Latin1Content conten
     if (stream->noQuotes) {
         // no quotes, write the string directly too (no pretty-printing)
         // this respects the QTextStream state, though
-        QString string = content == ContainsLatin1 ? QString::fromLatin1(begin, int(length)) : QString::fromUtf8(begin, int(length));
+        QString string = content == ContainsLatin1 ? QString::fromLatin1(begin, qsizetype(length))
+                                                   : QString::fromUtf8(begin, qsizetype(length));
         stream->ts.d_ptr->putString(string);
     } else {
         // we'll reset the QTextStream formatting mechanisms, so save the state
diff --git a/src/corelib/io/qdebug.h b/src/corelib/io/qdebug.h
index 62999d80117..40f65fd29b3 100644
--- a/src/corelib/io/qdebug.h
+++ b/src/corelib/io/qdebug.h
@@ -106,7 +106,7 @@ public:
     inline QDebug &operator<<(double t) { stream->ts << t; return maybeSpace(); }
     inline QDebug &operator<<(const char* t) { stream->ts << QString::fromUtf8(t); return maybeSpace(); }
     inline QDebug &operator<<(const char16_t *t)  { stream->ts << QStringView(t); return maybeSpace(); }
-    inline QDebug &operator<<(const QString & t) { putString(t.constData(), uint(t.length())); return maybeSpace(); }
+    inline QDebug &operator<<(const QString & t) { putString(t.constData(), size_t(t.length())); return maybeSpace(); }
     inline QDebug &operator<<(QStringView s) { putString(s.data(), size_t(s.size())); return maybeSpace(); }
     inline QDebug &operator<<(QUtf8StringView s) { putByteArray(reinterpret_cast<const char*>(s.data()), s.size(), ContainsBinary); return maybeSpace(); }
     inline QDebug &operator<<(QLatin1StringView t) { putByteArray(t.latin1(), t.size(), ContainsLatin1); return maybeSpace(); }