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--- a/libupnpp/control/cdircontent.hxx
+++ b/libupnpp/control/cdircontent.hxx
@@ -24,6 +24,8 @@
 
 #include "libupnpp/upnpavutils.hxx"
 
+namespace UPnPClient {
+
 /** 
  * UPnP resource. A resource describes one of the entities associated with 
  * a directory entry. This would be typically the audio file URI, and
@@ -114,7 +116,7 @@
             //?? Avoid returning 0, who knows...
             return 1;
         }
-        return upnpdurationtos(sdur);
+        return UPnPP::upnpdurationtos(sdur);
     }
 
     /** 
@@ -198,4 +200,6 @@
     bool parse(const std::string& didltext);
 };
 
+} // namespace
+
 #endif /* _UPNPDIRCONTENT_H_X_INCLUDED_ */