diff --git a/build.xml b/build.xml
index d44d858fb..4e932fb82 100644
--- a/build.xml
+++ b/build.xml
@@ -551,6 +551,7 @@
              classpathref="javadoc.classpath"
              Use="true"
              Footer="<a target="_top" href="./{@docRoot}/../index.html">Back to the Checkstyle Home Page</a>"
+             useExternalFile="yes"
              failonerror="yes" >
         <fileset dir="src/checkstyle">
           <exclude name="**/Generated*.java" />