diff --git a/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/pd/PBoxPDAnnot.java b/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/pd/PBoxPDAnnot.java
index b577ccbf..f04073fc 100644
--- a/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/pd/PBoxPDAnnot.java
+++ b/pdfbox-validation-model/src/main/java/org/verapdf/model/impl/pb/pd/PBoxPDAnnot.java
@@ -355,6 +355,11 @@ public Boolean getcontainsA() {
 		return pageObject instanceof COSDictionary && ((COSDictionary) pageObject).containsKey(COSName.A);
 	}
 
+	@Override
+	public Boolean getisArtifact() {
+		return null;
+	}
+
 	@Override
 	public List<? extends Object> getLinkedObjects(String link) {
 		switch (link) {