diff --git a/src/corelib/io/qdebug.cpp b/src/corelib/io/qdebug.cpp
index 7b49505228..f55f68f9b3 100644
--- a/src/corelib/io/qdebug.cpp
+++ b/src/corelib/io/qdebug.cpp
@@ -285,12 +285,12 @@ void QDebug::putString(const QChar *begin, size_t length)
     if (stream->testFlag(Stream::NoQuotes)) {
         // no quotes, write the string directly too (no pretty-printing)
         // this respects the QTextStream state, though
-        stream->ts.d_ptr->putString(begin, length);
+        stream->ts.d_ptr->putString(begin, int(length));
     } else {
         // we'll reset the QTextStream formatting mechanisms, so save the state
         QDebugStateSaver saver(*this);
         stream->ts.d_ptr->params.reset();
-        putEscapedString(stream->ts.d_ptr.data(), reinterpret_cast<const ushort *>(begin), length);
+        putEscapedString(stream->ts.d_ptr.data(), reinterpret_cast<const ushort *>(begin), int(length));
     }
 }
 
@@ -303,14 +303,14 @@ void QDebug::putByteArray(const char *begin, size_t length, Latin1Content conten
     if (stream->testFlag(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, length) : QString::fromUtf8(begin, length);
+        QString string = content == ContainsLatin1 ? QString::fromLatin1(begin, int(length)) : QString::fromUtf8(begin, int(length));
         stream->ts.d_ptr->putString(string);
     } else {
         // we'll reset the QTextStream formatting mechanisms, so save the state
         QDebugStateSaver saver(*this);
         stream->ts.d_ptr->params.reset();
         putEscapedString(stream->ts.d_ptr.data(), reinterpret_cast<const uchar *>(begin),
-                         length, content == ContainsLatin1);
+                         int(length), content == ContainsLatin1);
     }
 }
 
diff --git a/src/corelib/tools/qstring.cpp b/src/corelib/tools/qstring.cpp
index aa35d764fa..beda0f4919 100644
--- a/src/corelib/tools/qstring.cpp
+++ b/src/corelib/tools/qstring.cpp
@@ -240,7 +240,7 @@ void qt_from_latin1(ushort *dst, const char *str, size_t size)
     dst += offset;
     str += offset;
 #  ifdef Q_COMPILER_LAMBDA
-    return UnrollTailLoop<15>::exec(size, [=](int i) { dst[i] = (uchar)str[i]; });
+    return UnrollTailLoop<15>::exec(int(size), [=](int i) { dst[i] = (uchar)str[i]; });
 #  endif
 #endif
 #if defined(__mips_dsp)