Index: log4j-core/src/main/java/org/apache/logging/log4j/core/config/xml/XmlConfiguration.java
===================================================================
--- log4j-core/src/main/java/org/apache/logging/log4j/core/config/xml/XmlConfiguration.java	(revision 1613354)
+++ log4j-core/src/main/java/org/apache/logging/log4j/core/config/xml/XmlConfiguration.java	(working copy)
@@ -131,6 +131,7 @@
                 configStream.close();
             }
             final InputSource source = new InputSource(new ByteArrayInputStream(buffer));
+            source.setSystemId(configSource.getLocation());
             final Document document = newDocumentBuilder().parse(source);
             rootElement = document.getDocumentElement();
             final Map<String, String> attrs = processAttributes(rootNode, rootElement);