diff --git a/build.xml b/build.xml
index ee1154c6..4b2839a1 100644
--- a/build.xml
+++ b/build.xml
@@ -721,7 +721,7 @@
                 <args/>
                 <arg value="--validateSchema"/>
                 <arg value="--schemaDirectory"/>
-                <arg value="${xml.dir}"/>
+                <arg value="${mdx.dir}/schema"/>
                 <arg value="--inFile"/>
                 <arg value="${xml.dir}/@{i}"/>
             </java>