diff --git a/src/sparqlunicorn_ontdoc/docgeneration.py b/src/sparqlunicorn_ontdoc/docgeneration.py
index 1bad7c1e..f517aed9 100644
--- a/src/sparqlunicorn_ontdoc/docgeneration.py
+++ b/src/sparqlunicorn_ontdoc/docgeneration.py
@@ -622,7 +622,7 @@ def createVoidDataset(self,dsname,numtriples,numclasses,numinds,numpredicates,nu
             if str(namespace) in DocConfig.namespaceToTopic:
                 for entry in DocConfig.namespaceToTopic[str(namespace)]:
                     g.add((URIRef(voidds), URIRef("http://purl.org/dc/terms/subject"),
-                           URIRef(DocConfig.namespaceToTopic[entry])))
+                           URIRef(DocConfig.namespaceToTopic[str(namespace)][entry])))
         g.serialize(self.outpath+"/void.ttl", encoding="utf-8")
         return g