diff --git a/spring-integration-mail/src/main/java/org/springframework/integration/mail/AbstractMailReceiver.java b/spring-integration-mail/src/main/java/org/springframework/integration/mail/AbstractMailReceiver.java
index 33f8c1c4be..94d7e6790f 100755
--- a/spring-integration-mail/src/main/java/org/springframework/integration/mail/AbstractMailReceiver.java
+++ b/spring-integration-mail/src/main/java/org/springframework/integration/mail/AbstractMailReceiver.java
@@ -399,7 +399,7 @@ public abstract class AbstractMailReceiver extends IntegrationObjectSupport impl
 	 * @since 2.2
 	 *
 	 */
-	public class IntegrationMimeMessage extends MimeMessage {
+	private class IntegrationMimeMessage extends MimeMessage {
 
 		public IntegrationMimeMessage(MimeMessage source) throws MessagingException {
 			super(source);