diff --git a/codec/src/main/java/io/netty/handler/codec/embedder/EmbeddedChannel.java b/codec/src/main/java/io/netty/handler/codec/embedder/EmbeddedChannel.java
index 9a91dd1ce2..0db038121c 100644
--- a/codec/src/main/java/io/netty/handler/codec/embedder/EmbeddedChannel.java
+++ b/codec/src/main/java/io/netty/handler/codec/embedder/EmbeddedChannel.java
@@ -76,8 +76,9 @@ class EmbeddedChannel extends AbstractChannel {
     }
 
     @Override
-    protected void doRegister() throws Exception {
+    protected Runnable doRegister() throws Exception {
         state = 1;
+        return null;
     }
 
     @Override