diff --git a/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/pd/PBoxPDStructElem.java b/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/pd/PBoxPDStructElem.java
index 112790c1..ba3807a3 100644
--- a/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/pd/PBoxPDStructElem.java
+++ b/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/pd/PBoxPDStructElem.java
@@ -116,6 +116,11 @@ public String getparentStandardType() {
 		return null;
 	}
 
+	@Override
+	public String getnamespaceAndTag() {
+		return null;
+	}
+
 	@Override
 	public Boolean getcontainsParent() {
 		return ((COSDictionary) this.simplePDObject).getDictionaryObject(COSName.P) != null;