diff --git a/doc/reference/docbook.build b/doc/reference/docbook.build
index 1a555658..e6576556 100644
--- a/doc/reference/docbook.build
+++ b/doc/reference/docbook.build
@@ -83,7 +83,7 @@
         <exclude name="*.chm"/>
       </fileset>
     </delete>
-
+    <delete file="${project.targetdir}\htmlhelp\spring-net-reference.chm"/>
     <move file="${project.targetdir}\htmlhelp\htmlhelp.chm"
 	  tofile="${project.targetdir}\htmlhelp\spring-net-reference.chm" verbose="true"/>
   </target>