diff --git a/handler/src/main/java/io/netty/handler/ssl/SslUtils.java b/handler/src/main/java/io/netty/handler/ssl/SslUtils.java
index 71c7c1c5d4..2f3b5b877f 100644
--- a/handler/src/main/java/io/netty/handler/ssl/SslUtils.java
+++ b/handler/src/main/java/io/netty/handler/ssl/SslUtils.java
@@ -48,6 +48,11 @@ final class SslUtils {
      */
     static final int SSL_CONTENT_TYPE_APPLICATION_DATA = 23;
 
+    /**
+     * HeartBeat Extension
+     */
+    static final int SSL_CONTENT_TYPE_EXTENSION_HEARTBEAT = 24;
+
     /**
      * the length of the ssl record header (in bytes)
      */
@@ -90,6 +95,7 @@ final class SslUtils {
             case SSL_CONTENT_TYPE_ALERT:
             case SSL_CONTENT_TYPE_HANDSHAKE:
             case SSL_CONTENT_TYPE_APPLICATION_DATA:
+            case SSL_CONTENT_TYPE_EXTENSION_HEARTBEAT:
                 tls = true;
                 break;
             default:
@@ -176,6 +182,7 @@ final class SslUtils {
             case SSL_CONTENT_TYPE_ALERT:
             case SSL_CONTENT_TYPE_HANDSHAKE:
             case SSL_CONTENT_TYPE_APPLICATION_DATA:
+            case SSL_CONTENT_TYPE_EXTENSION_HEARTBEAT:
                 tls = true;
                 break;
             default: