diff --git a/spring-context/src/main/java/org/springframework/messaging/MessageHeaders.java b/spring-context/src/main/java/org/springframework/messaging/MessageHeaders.java
index e45acfc8fabde59953e5ccbf002e5c531f3cdd51..21ae96dd23a50d0767f3cd389e1fb24038d20ba6 100644
--- a/spring-context/src/main/java/org/springframework/messaging/MessageHeaders.java
+++ b/spring-context/src/main/java/org/springframework/messaging/MessageHeaders.java
@@ -58,7 +58,7 @@ import org.apache.commons.logging.LogFactory;
  * @author Gary Russell
  * @since 4.0
  */
-public final class MessageHeaders implements Map<String, Object>, Serializable {
+public class MessageHeaders implements Map<String, Object>, Serializable {
 
 	private static final long serialVersionUID = 8946067357652612145L;