diff --git a/src/frontend/mosh-server.cc b/src/frontend/mosh-server.cc
index b6c6c26..4a13496 100644
--- a/src/frontend/mosh-server.cc
+++ b/src/frontend/mosh-server.cc
@@ -213,6 +213,7 @@ int main( int argc, char *argv[] )
 	desired_port = optarg;
 	break;
       case 's':
+	desired_ip = NULL;
 	desired_ip_str = get_SSH_IP();
 	if ( !desired_ip_str.empty() ) {
 	  desired_ip = desired_ip_str.c_str();