diff --git a/src/sparqlunicorn_ontdoc/export/data/voidexporter.py b/src/sparqlunicorn_ontdoc/export/data/voidexporter.py
index 5ea69d3b..398bc7bb 100644
--- a/src/sparqlunicorn_ontdoc/export/data/voidexporter.py
+++ b/src/sparqlunicorn_ontdoc/export/data/voidexporter.py
@@ -55,7 +55,7 @@ def createVoidDataset(dsname,prefixnamespace,deploypath,outpath,licenseuri,modti
             g.add((URIRef(cururi),URIRef("http://rdfs.org/ns/void#property"),URIRef(pred)))
             g.add((URIRef(cururi),URIRef("http://rdfs.org/ns/void#triples"),Literal(str(propstats[pred]["triples"]),datatype="http://www.w3.org/2001/XMLSchema#integer")))
         for item in classtree["core"]["data"]:
-            cururi = voidds +"_"+ DocUtils.shortenURI(item)
+            cururi = voidds +"_"+ DocUtils.shortenURI(item["id"])
             g.add((URIRef(voidds), URIRef("http://rdfs.org/ns/void#classPartition"), URIRef(cururi)))
             g.add((URIRef(cururi), URIRef("http://rdfs.org/ns/void#class"), URIRef(item["type"])))
             g.add((URIRef(cururi), URIRef("http://rdfs.org/ns/void#entities"),Literal(str(stats["numentities"]), datatype="http://www.w3.org/2001/XMLSchema#integer")))