diff --git a/aspectwerkz/plugin.jelly b/aspectwerkz/plugin.jelly
index 57ebcca3..3a82c988 100644
--- a/aspectwerkz/plugin.jelly
+++ b/aspectwerkz/plugin.jelly
@@ -263,7 +263,8 @@
       <ant:arg value="-haltOnError"/>
 
       <j:if test="${!empty(aspectwerkzcp)}">
-        <ant:arg line="-cp ${aspectwerkzcp}"/>
+        <ant:arg value="-cp"/>
+        <ant:arg pathref="aspectwerkzc.cp"/>
       </j:if>
 
       <!-- If using the attribdef mode, weave classes generated by aspectc -->