diff --git a/matchbox-engine/src/main/java/org/hl7/fhir/validation/instance/InstanceValidator.java b/matchbox-engine/src/main/java/org/hl7/fhir/validation/instance/InstanceValidator.java
index 7d2fd0aad48..8ee8f1b8ed1 100644
--- a/matchbox-engine/src/main/java/org/hl7/fhir/validation/instance/InstanceValidator.java
+++ b/matchbox-engine/src/main/java/org/hl7/fhir/validation/instance/InstanceValidator.java
@@ -4369,7 +4369,7 @@ private List<ElementDefinition> getCriteriaForDiscriminator(String path, Element
         StructureDefinition sd = context.fetchResource(StructureDefinition.class, p.getValue(), profile);
         // PATCH: https://github.com/ahdis/matchbox/issues/138 try to check if it is a cross version extension
         if (sd == null) {
-          sd = getXverExt(new ArrayList<ValidationMessage>(), "", null, p.getValue());
+          sd = getXverExt(new ArrayList<ValidationMessage>(), path, new Element("profile"), p.getValue());
         }
         if (sd == null)
           throw new DefinitionException(context.formatMessage(I18nConstants.SD_ED_TYPE_PROFILE_UNKNOWN, p));