diff --git a/src/main/java/com/corundumstudio/socketio/handler/WrongUrlHandler.java b/src/main/java/com/corundumstudio/socketio/handler/WrongUrlHandler.java
index 0b7c888..0342ca0 100644
--- a/src/main/java/com/corundumstudio/socketio/handler/WrongUrlHandler.java
+++ b/src/main/java/com/corundumstudio/socketio/handler/WrongUrlHandler.java
@@ -31,6 +31,7 @@ import io.netty.handler.codec.http.FullHttpRequest;
 import io.netty.handler.codec.http.HttpResponse;
 import io.netty.handler.codec.http.HttpResponseStatus;
 import io.netty.handler.codec.http.QueryStringDecoder;
+import io.netty.util.ReferenceCountUtil;
 
 @Sharable
 public class WrongUrlHandler extends ChannelInboundHandlerAdapter {