diff --git a/buildSrc/src/main/groovy/org/springframework/build/gradle/MergePlugin.groovy b/buildSrc/src/main/groovy/org/springframework/build/gradle/MergePlugin.groovy
index 510a2698c6a..4143780702b 100644
--- a/buildSrc/src/main/groovy/org/springframework/build/gradle/MergePlugin.groovy
+++ b/buildSrc/src/main/groovy/org/springframework/build/gradle/MergePlugin.groovy
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2012 the original author or authors.
+ * Copyright 2002-2013 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.
@@ -110,7 +110,7 @@ class MergePlugin implements Plugin<Project> {
 
 		// update 'into' project artifacts to contain the source artifact contents
 		project.merge.into.sourcesJar.from(project.sourcesJar.source)
-		project.merge.into.jar.from(project.jar.source)
+		project.merge.into.jar.from(project.sourceSets.main.output)
 		project.merge.into.javadoc {
 			source += project.javadoc.source
 			classpath += project.javadoc.classpath