fixed bug that didn't surface on OS X
fixed bug that didn't surface on OS X

armandobs14/rdflib,RDFLib/rdflib,marma/rdflib,armandobs14/rdflib,ssssam/rdflib,avorio/rdflib,yingerj/rdflib,RDFLib/rdflib,yingerj/rdflib,ssssam/rdflib,marma/rdflib,marma/rdflib,dbs/rdflib,dbs/rdflib,RDFLib/rdflib,yingerj/rdflib,ssssam/rdflib,dbs/rdflib,marma/rdflib,RDFLib/rdflib,avorio/rdflib,yingerj/rdflib,ssssam/rdflib,avorio/rdflib,armandobs14/rdflib,avorio/rdflib,armandobs14/rdflib,dbs/rdflib