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--- a/avtadapt.h
+++ b/avtadapt.h
@@ -26,6 +26,8 @@
 
 #include "upqo/avtransport_qo.h"
 #include "upputils.h"
+
+using namespace UPnPClient;
 
 class MetaDataAdaptor : public AVTMetadata {
 public: