diff --git a/tests/auto/corelib/text/qbytearray/tst_qbytearray.cpp b/tests/auto/corelib/text/qbytearray/tst_qbytearray.cpp
index f3e91151811..676c6c6cbe2 100644
--- a/tests/auto/corelib/text/qbytearray/tst_qbytearray.cpp
+++ b/tests/auto/corelib/text/qbytearray/tst_qbytearray.cpp
@@ -150,7 +150,7 @@ QByteArray verifyZeroTermination(const QByteArray &ba)
     if (!baDataPtr->isMutable())
         return ba;
 
-    int baSize = ba.size();
+    qsizetype baSize = ba.size();
     char baTerminator = ba.constData()[baSize];
     if ('\0' != baTerminator)
         return QString::fromUtf8(