silence clang warning

diff --git a/pdns/dnsparser.cc b/pdns/dnsparser.cc
index b0030fdd413e9697bec2e8a9b36f5766be311e27..a03644e8b04afacfe638f6d709b005ab9b19e043 100644 (file)
--- a/pdns/dnsparser.cc
+++ b/pdns/dnsparser.cc
@@ -554,7 +554,7 @@ string simpleCompress(const string& elabel, const string& root)
 void simpleExpandTo(const string& label, unsigned int frompos, string& ret)
 {
   unsigned int labellen=0;
-  while((labellen=label.at(frompos++))) {
+  while((labellen=(unsigned char)label.at(frompos++))) {
     ret.append(label.c_str()+frompos, labellen);
     ret.append(1,'.');
     frompos+=labellen;