--- src/fetch/z3950connection.cpp
+++ src/fetch/z3950connection.cpp
@@ -442,13 +442,13 @@ QString Z3950Connection::toXML(const QCS
 
   // first 5 bytes are length
   bool ok;
-  int len = marc_.left(5).toInt(&ok);
+  size_t len = marc_.left(5).toUInt(&ok);
   if(ok && (len < 25 || len > 100000)) {
     myDebug() << "Z3950Connection::toXML() - bad length: " << (ok ? len : -1) << endl;
     return QString::null;
   }
 
-  char* result;
+  const char* result;
   int r = yaz_marc_decode_buf(mt, marc_, -1, &result, &len);
   if(r <= 0) {
     myDebug() << "Z3950Connection::toXML() - can't decode buffer" << endl;