diff --git a/src/main/java/com/github/nkzawa/engineio/client/Socket.java b/src/main/java/com/github/nkzawa/engineio/client/Socket.java
index f678087..c1b3616 100644
--- a/src/main/java/com/github/nkzawa/engineio/client/Socket.java
+++ b/src/main/java/com/github/nkzawa/engineio/client/Socket.java
@@ -103,12 +103,11 @@ public abstract class Socket extends Emitter {
         Socket.sockets.evs.emit("add", this);
     }
 
-    public Socket open() {
+    public void open() {
         this.readyState = "opening";
         Transport transport = this.createTransport(this.transports.get(0));
         this.setTransport(transport);
         transport.open();
-        return this;
     }
 
     private Transport createTransport(String name) {
diff --git a/src/test/java/com/github/nkzawa/engineio/client/SocketTest.java b/src/test/java/com/github/nkzawa/engineio/client/SocketTest.java
index 4f68e4c..6a5365d 100644
--- a/src/test/java/com/github/nkzawa/engineio/client/SocketTest.java
+++ b/src/test/java/com/github/nkzawa/engineio/client/SocketTest.java
@@ -98,7 +98,8 @@ public class SocketTest {
                 System.out.println("onclose:");
                 events.offer("onclose");
             }
-        }.open();
+        };
+        socket.open();
 
         assertThat(events.take(), is("onopen"));
         socket.close();