diff --git a/transport/src/main/java/io/netty/channel/AbstractChannel.java b/transport/src/main/java/io/netty/channel/AbstractChannel.java
index 386648197a..bd876750b4 100644
--- a/transport/src/main/java/io/netty/channel/AbstractChannel.java
+++ b/transport/src/main/java/io/netty/channel/AbstractChannel.java
@@ -374,6 +374,10 @@ public abstract class AbstractChannel extends DefaultAttributeMap implements Cha
         /** true if the channel has never been registered, false otherwise */
         private boolean neverRegistered = true;
 
+        private void assertEventLoop() {
+            assert !registered || eventLoop.inEventLoop();
+        }
+
         @Override
         public final ChannelOutboundBuffer outboundBuffer() {
             return outboundBuffer;
@@ -470,6 +474,8 @@ public abstract class AbstractChannel extends DefaultAttributeMap implements Cha
 
         @Override
         public final void bind(final SocketAddress localAddress, final ChannelPromise promise) {
+            assertEventLoop();
+
             if (!promise.setUncancellable() || !ensureOpen(promise)) {
                 return;
             }
@@ -510,6 +516,8 @@ public abstract class AbstractChannel extends DefaultAttributeMap implements Cha
 
         @Override
         public final void disconnect(final ChannelPromise promise) {
+            assertEventLoop();
+
             if (!promise.setUncancellable()) {
                 return;
             }
@@ -538,6 +546,8 @@ public abstract class AbstractChannel extends DefaultAttributeMap implements Cha
 
         @Override
         public final void close(final ChannelPromise promise) {
+            assertEventLoop();
+
             close(promise, CLOSED_CHANNEL_EXCEPTION, false);
         }
 
@@ -630,6 +640,8 @@ public abstract class AbstractChannel extends DefaultAttributeMap implements Cha
 
         @Override
         public final void closeForcibly() {
+            assertEventLoop();
+
             try {
                 doClose();
             } catch (Exception e) {
@@ -639,7 +651,9 @@ public abstract class AbstractChannel extends DefaultAttributeMap implements Cha
 
         @Override
         public final void deregister(final ChannelPromise promise) {
-           deregister(promise, false);
+            assertEventLoop();
+
+            deregister(promise, false);
         }
 
         private void deregister(final ChannelPromise promise, final boolean fireChannelInactive) {
@@ -688,6 +702,8 @@ public abstract class AbstractChannel extends DefaultAttributeMap implements Cha
 
         @Override
         public final void beginRead() {
+            assertEventLoop();
+
             if (!isActive()) {
                 return;
             }
@@ -707,6 +723,8 @@ public abstract class AbstractChannel extends DefaultAttributeMap implements Cha
 
         @Override
         public final void write(Object msg, ChannelPromise promise) {
+            assertEventLoop();
+
             ChannelOutboundBuffer outboundBuffer = this.outboundBuffer;
             if (outboundBuffer == null) {
                 // If the outboundBuffer is null we know the channel was closed and so
@@ -737,6 +755,8 @@ public abstract class AbstractChannel extends DefaultAttributeMap implements Cha
 
         @Override
         public final void flush() {
+            assertEventLoop();
+
             ChannelOutboundBuffer outboundBuffer = this.outboundBuffer;
             if (outboundBuffer == null) {
                 return;
@@ -797,6 +817,8 @@ public abstract class AbstractChannel extends DefaultAttributeMap implements Cha
 
         @Override
         public final ChannelPromise voidPromise() {
+            assertEventLoop();
+
             return unsafeVoidPromise;
         }