diff --git a/XML/src/XMLWriter.cpp b/XML/src/XMLWriter.cpp
index 5ccaba0bf..0e9e1a255 100644
--- a/XML/src/XMLWriter.cpp
+++ b/XML/src/XMLWriter.cpp
@@ -710,7 +710,7 @@ void XMLWriter::declareNamespaces(const XMLString& namespaceURI, const XMLString
 {
 	std::map<XMLString, std::set<XMLString> > usedNamespaces;
 	bool defaultNameSpaceUsed = false;
-	XMLString defaultNamespaceURI = _namespaces.getURI(std::string());
+	XMLString defaultNamespaceURI = _namespaces.getURI(XMLString());
 	XMLString local;
 	XMLString prefix;
 	XMLString elementNamespaceURI = namespaceURI;