diff --git a/pdf/plugin.jelly b/pdf/plugin.jelly
index cf637776..185fd91f 100644
--- a/pdf/plugin.jelly
+++ b/pdf/plugin.jelly
@@ -1,6 +1,6 @@
 <?xml version="1.0"?>
 
-<project xmlns:j="jelly:core">
+<project xmlns:j="jelly:core" xmlns:u="jelly:util">
 
   <goal 
     name="pdf:init"
@@ -27,6 +27,8 @@
       property="maven.fo.navigation.available"/>
     <fail message="PDF generation cannot complete as ${docsSrc}/navigation.xml is missing"
       unless="maven.fo.navigation.available"/>
+    <u:file name="${plugin.resources}/project2fo.xslt" var="stylesheetFile" />
+    <u:file name="${docsSrc}/navigation.xml" var="navigationFile" />
     <java classname="org.apache.xalan.xslt.Process" fork="yes" failonerror="true">
       <classpath>
         <pathelement location="${plugin.getDependencyPath('xerces')}"/>
@@ -35,11 +37,11 @@
       </classpath>
       <sysproperty key="user.language" value="en"/>
       <arg value="-in"/>
-      <arg value="file://${docsSrc}/navigation.xml"/>
+      <arg value="${navigationFile.toURL().toExternalForm()}"/>
       <arg value="-out"/>
       <arg value="${docsDest}/project.fo"/>
       <arg value="-xsl"/>
-      <arg value="file://${plugin.resources}/project2fo.xslt"/>
+      <arg value="${stylesheetFile.toURL().toExternalForm()}"/>
       <arg value="-param"/>
       <arg value="basePath"/>
       <arg value="${docsSrc}"/>