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--- a/libupnpp/control/discovery.cxx
+++ b/libupnpp/control/discovery.cxx
@@ -37,6 +37,8 @@
 #include "description.hxx"
 #include "discovery.hxx"
 
+using namespace UPnPP;
+
 namespace UPnPClient {
 
 static UPnPDeviceDirectory *theDevDir;