diff --git a/network.cpp b/network.cpp
index d60205a..55232d8 100644
--- a/network.cpp
+++ b/network.cpp
@@ -77,7 +77,7 @@ void Connection::setup( void )
   }
 
   /* Enable path MTU discovery */
-  char flag = IP_PMTUDISC_WANT;
+  char flag = IP_PMTUDISC_DO;
   socklen_t optlen = sizeof( flag );
   if ( setsockopt( sock, IPPROTO_IP, IP_MTU_DISCOVER, &flag, optlen ) < 0 ) {
     throw NetworkException( "setsockopt", errno );