diff --git a/build.xml b/build.xml
index f6931afa50..a3564f0159 100644
--- a/build.xml
+++ b/build.xml
@@ -845,6 +845,7 @@ under the License.
                     <include name="org/apache/poi/POIXMLTypeLoader.java"/>
                     <include name="org/apache/poi/util/DocumentHelper.java"/>
                     <include name="org/apache/poi/util/SAXHelper.java"/>
+                    <include name="org/apache/poi/openxml4j/opc/PackageNamespaces.java"/>
                 </fileset>
                 <fileset dir="${main.src}">
                     <include name="org/apache/poi/util/POILogFactory.java"/>
diff --git a/sonar/pom.xml b/sonar/pom.xml
index 24b5889902..3e9314cb6a 100644
--- a/sonar/pom.xml
+++ b/sonar/pom.xml
@@ -223,6 +223,7 @@
                         <include name="org/apache/poi/POIXMLTypeLoader.java"/>
                         <include name="org/apache/poi/util/DocumentHelper.java"/>
                         <include name="org/apache/poi/util/SAXHelper.java"/>
+                        <include name="org/apache/poi/openxml4j/opc/PackageNamespaces.java"/>
                       </fileset>
                       <fileset dir="${basedir}/../../src/java">
                         <include name="org/apache/poi/util/POILogFactory.java"/>