diff --git a/poi-ooxml/src/test/java/org/apache/poi/xssf/extractor/TestXSSFExportToXML.java b/poi-ooxml/src/test/java/org/apache/poi/xssf/extractor/TestXSSFExportToXML.java
index e4c5e6015d..9100040136 100644
--- a/poi-ooxml/src/test/java/org/apache/poi/xssf/extractor/TestXSSFExportToXML.java
+++ b/poi-ooxml/src/test/java/org/apache/poi/xssf/extractor/TestXSSFExportToXML.java
@@ -677,7 +677,7 @@ public final class TestXSSFExportToXML {
         }
     }
 
-    private class XPathNSContext implements NamespaceContext {
+    private static class XPathNSContext implements NamespaceContext {
         final Map<String,String> nsMap = new HashMap<>();
 
         XPathNSContext() {