diff --git a/build.xml b/build.xml
index f4677b2d..a0a840b8 100644
--- a/build.xml
+++ b/build.xml
@@ -30,6 +30,11 @@
 	<fail unless="vitro.core.dir"
 	      message="${deploy.properties.file} must contain a value for vitro.core.dir" />
 
+	<!--
+		Locate the core script in terms that the product script requires.
+	-->
+	<property name="inner.basedir" location="${vitro.core.dir}/webapp" />
+
 	<!--
 		Override the default location for project modifications.
 	-->