diff --git a/bin/ssmanager.rs b/bin/ssmanager.rs
index 2093b533..fb7ea441 100644
--- a/bin/ssmanager.rs
+++ b/bin/ssmanager.rs
@@ -203,7 +203,7 @@ fn main() {
         // Overrides
         if matches.is_present("UDP_ONLY") {
             if let Some(ref mut m) = config.manager {
-                m.mode = m.mode.merge(Mode::UdpOnly);
+                m.mode = Mode::UdpOnly;
             }
         }
 
diff --git a/bin/ssserver.rs b/bin/ssserver.rs
index 171762d8..0d0b6aa9 100644
--- a/bin/ssserver.rs
+++ b/bin/ssserver.rs
@@ -178,7 +178,7 @@ fn main() {
             }
 
             if matches.is_present("UDP_ONLY") {
-                sc.set_mode(sc.mode().merge(Mode::UdpOnly));
+                sc.set_mode(Mode::UdpOnly);
             }
 
             if matches.is_present("TCP_AND_UDP") {