--- a/src/corelib/xml/qxmlstream.cpp	Fri Sep 17 08:34:18 2010 +0300
+++ b/src/corelib/xml/qxmlstream.cpp	Mon Oct 04 01:19:32 2010 +0300
@@ -1523,7 +1523,7 @@
         decoder = codec->makeDecoder();
     }
 
-    decoder->toUnicode(&readBuffer, rawReadBuffer.data(), nbytesread);
+    decoder->toUnicode(&readBuffer, rawReadBuffer.constData(), nbytesread);
 
     if(lockEncoding && decoder->hasFailure()) {
         raiseWellFormedError(QXmlStream::tr("Encountered incorrectly encoded content."));