diff --git a/org.springframework.aop/src/main/java/org/springframework/aop/target/AbstractPrototypeBasedTargetSource.java b/org.springframework.aop/src/main/java/org/springframework/aop/target/AbstractPrototypeBasedTargetSource.java
index 6ce2bca6ec..83c8083e5b 100644
--- a/org.springframework.aop/src/main/java/org/springframework/aop/target/AbstractPrototypeBasedTargetSource.java
+++ b/org.springframework.aop/src/main/java/org/springframework/aop/target/AbstractPrototypeBasedTargetSource.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2009 the original author or authors.
+ * Copyright 2002-2011 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.
@@ -16,7 +16,9 @@
 
 package org.springframework.aop.target;
 
+import java.io.IOException;
 import java.io.NotSerializableException;
+import java.io.ObjectInputStream;
 import java.io.ObjectStreamException;
 
 import org.springframework.beans.BeansException;
@@ -91,6 +93,11 @@ public abstract class AbstractPrototypeBasedTargetSource extends AbstractBeanFac
 	// Serialization support
 	//---------------------------------------------------------------------
 
+	private void readObject(ObjectInputStream ois) throws IOException, ClassNotFoundException {
+		throw new NotSerializableException("A prototype-based TargetSource itself is not deserializable - " +
+				"just a disconnected SingletonTargetSource is");
+	}
+
 	/**
 	 * Replaces this object with a SingletonTargetSource on serialization.
 	 * Protected as otherwise it won't be invoked for subclasses.