diff --git a/src/corelib/text/qstringconverter.cpp b/src/corelib/text/qstringconverter.cpp
index e8323745d2..e66f512ed8 100644
--- a/src/corelib/text/qstringconverter.cpp
+++ b/src/corelib/text/qstringconverter.cpp
@@ -1217,7 +1217,7 @@ static QString convertToUnicodeCharByChar(QByteArrayView in, QStringConverter::S
         copyLocation = state->remainingChars;
         extra += copyLocation;
     }
-    int newLength = length + extra;
+    qsizetype newLength = length + extra;
     char *mbcs = new char[newLength];
     //ensure that we have a NULL terminated string
     mbcs[newLength-1] = 0;
diff --git a/src/corelib/tools/qmessageauthenticationcode.cpp b/src/corelib/tools/qmessageauthenticationcode.cpp
index addd19d72e..5f86afc537 100644
--- a/src/corelib/tools/qmessageauthenticationcode.cpp
+++ b/src/corelib/tools/qmessageauthenticationcode.cpp
@@ -213,7 +213,7 @@ void QMessageAuthenticationCode::setKey(const QByteArray &key)
 /*!
     Adds the first \a length chars of \a data to the message.
 */
-void QMessageAuthenticationCode::addData(const char *data, int length)
+void QMessageAuthenticationCode::addData(const char *data, qsizetype length)
 {
     d->initMessageHash();
     d->messageHash.addData(data, length);
diff --git a/src/corelib/tools/qmessageauthenticationcode.h b/src/corelib/tools/qmessageauthenticationcode.h
index a13a3d2acf..343bf9d617 100644
--- a/src/corelib/tools/qmessageauthenticationcode.h
+++ b/src/corelib/tools/qmessageauthenticationcode.h
@@ -59,7 +59,7 @@ public:
 
     void setKey(const QByteArray &key);
 
-    void addData(const char *data, int length);
+    void addData(const char *data, qsizetype length);
     void addData(const QByteArray &data);
     bool addData(QIODevice *device);