--- a/src/node/ipv4-address.cc	Wed Feb 27 20:48:43 2008 +0100
+++ b/src/node/ipv4-address.cc	Wed Feb 27 21:41:34 2008 +0100
@@ -305,14 +305,14 @@
 {
   std::string str;
   is >> str;
-  address = Ipv4Address (str);
+  address = Ipv4Address (str.c_str ());
   return is;
 }
 std::istream & operator >> (std::istream &is, Ipv4Mask &mask)
 {
   std::string str;
   is >> str;
-  mask = Ipv4Mask (str);
+  mask = Ipv4Mask (str.c_str ());
   return is;
 }