diff --git a/tests/case_file/kb.json b/tests/case_file/kb.json
index 1739ecc..454e492 100644
--- a/tests/case_file/kb.json
+++ b/tests/case_file/kb.json
@@ -4,7 +4,8 @@
         "rdf": "http://www.w3.org/1999/02/22-rdf-syntax-ns#",
         "uco-core": "https://unifiedcyberontology.org/ontology/uco/core#",
         "uco-observable": "https://unifiedcyberontology.org/ontology/uco/observable#",
-        "uco-types": "https://unifiedcyberontology.org/ontology/uco/types#"
+        "uco-types": "https://unifiedcyberontology.org/ontology/uco/types#",
+        "xsd": "http://www.w3.org/2001/XMLSchema#"
     },
     "@graph": [
         {
diff --git a/tests/src/compact.py b/tests/src/compact.py
index 24b1509..16c25ce 100644
--- a/tests/src/compact.py
+++ b/tests/src/compact.py
@@ -64,6 +64,10 @@ def _accrue_local_context(doc_object):
         _logger.debug("total_context = %r." % total_context)
 
         compacted = pyld.jsonld.compact(doc, total_context)
+
+        # Add xsd prefix back in to context dictionary.  .compact() removes it, and this causes some xsd definitions like xsd:long to no longer resolve in SPARQL queries.
+        compacted["@context"]["xsd"] = "http://www.w3.org/2001/XMLSchema#"
+
         out_fh.write(json.dumps(compacted, indent=4))
 
 if __name__ == "__main__":