diff --git a/spring-binding/src/main/java/org/springframework/binding/mapping/impl/DefaultMappingResults.java b/spring-binding/src/main/java/org/springframework/binding/mapping/impl/DefaultMappingResults.java
index a965e8fe..e61b1b40 100644
--- a/spring-binding/src/main/java/org/springframework/binding/mapping/impl/DefaultMappingResults.java
+++ b/spring-binding/src/main/java/org/springframework/binding/mapping/impl/DefaultMappingResults.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2004-2012 the original author or authors.
+ * Copyright 2004-2018 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -29,9 +29,9 @@ import org.springframework.binding.mapping.MappingResultsCriteria;
  */
 public class DefaultMappingResults implements MappingResults {
 
-	private Object source;
+	private transient Object source;
 
-	private Object target;
+	private transient Object target;
 
 	private List<MappingResult> mappingResults;