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--- a/upmpd/ohplaylist.hxx
+++ b/upmpd/ohplaylist.hxx
@@ -20,6 +20,8 @@
 #include <string>
 
 #include "libupnpp/device/device.hxx"
+
+using namespace UPnPP;
 
 class UpMpd;
 class UpMpdRenderCtl;