diff --git a/transport/src/main/java/io/netty/bootstrap/Bootstrap.java b/transport/src/main/java/io/netty/bootstrap/Bootstrap.java
index cd06e74286..b1175aaeb7 100644
--- a/transport/src/main/java/io/netty/bootstrap/Bootstrap.java
+++ b/transport/src/main/java/io/netty/bootstrap/Bootstrap.java
@@ -42,7 +42,7 @@ public final class Bootstrap extends AbstractBootstrap<Bootstrap, Channel> {
 
     public Bootstrap() { }
 
-    public Bootstrap(Bootstrap bootstrap) {
+    private Bootstrap(Bootstrap bootstrap) {
         super(bootstrap);
         remoteAddress = bootstrap.remoteAddress;
     }
diff --git a/transport/src/main/java/io/netty/bootstrap/ServerBootstrap.java b/transport/src/main/java/io/netty/bootstrap/ServerBootstrap.java
index c0e0a3eb89..fd2ea1338a 100644
--- a/transport/src/main/java/io/netty/bootstrap/ServerBootstrap.java
+++ b/transport/src/main/java/io/netty/bootstrap/ServerBootstrap.java
@@ -61,7 +61,7 @@ public final class ServerBootstrap extends AbstractBootstrap<ServerBootstrap, Se
 
     public ServerBootstrap() { }
 
-    public ServerBootstrap(ServerBootstrap bootstrap) {
+    private ServerBootstrap(ServerBootstrap bootstrap) {
         super(bootstrap);
         childGroup = bootstrap.childGroup;
         childHandler = bootstrap.childHandler;