diff --git a/spring-integration-file/src/main/java/org/springframework/integration/file/FileWritingMessageHandler.java b/spring-integration-file/src/main/java/org/springframework/integration/file/FileWritingMessageHandler.java
index ef28df6be5..b06a23657f 100644
--- a/spring-integration-file/src/main/java/org/springframework/integration/file/FileWritingMessageHandler.java
+++ b/spring-integration-file/src/main/java/org/springframework/integration/file/FileWritingMessageHandler.java
@@ -57,7 +57,7 @@ import java.nio.charset.Charset;
  */
 public class FileWritingMessageHandler extends AbstractReplyProducingMessageHandler {
 
-	public volatile String temporaryFileSuffix =".writing";
+	private volatile String temporaryFileSuffix =".writing";
 
 	private final Log logger = LogFactory.getLog(this.getClass());