diff --git a/build.xml b/build.xml
index 731f10ca52..58edc4ef54 100644
--- a/build.xml
+++ b/build.xml
@@ -409,6 +409,7 @@ under the License.
         <path refid="main.classpath"/>
         <pathelement location="${main.output.dir}"/>
         <pathelement location="${ooxml.security.jar}"/>
+        <pathelement location="${ooxml.test.guava.jar}"/>
         <!-- classes are omitted on test cases outside the xml-dsign area to avoid classpath poisioning -->
         <!--path refid="ooxml.xmlsec.classpath"/-->
         <!-- Used only for ExtractorFactory, see #57963 -->