diff --git a/prebuild.xml b/prebuild.xml
index 2d35529f81..29d7c90da3 100644
--- a/prebuild.xml
+++ b/prebuild.xml
@@ -1635,7 +1635,7 @@
       <Reference name="System.Xml"/>
       <Reference name="System.Drawing"/>
       <Reference name="System.Web"/>
-      <Reference name="Ionic.Zip"/>
+      <Reference name="Ionic.Zip" path="../../../bin/"/>
       <Reference name="NDesk.Options" path="../../../bin/"/>
       <Reference name="OpenMetaverseTypes" path="../../../bin/"/>
       <Reference name="OpenMetaverse.StructuredData" path="../../../bin/"/>