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--- a/upmpd/ohmetacache.cxx
+++ b/upmpd/ohmetacache.cxx
@@ -25,6 +25,8 @@
 #include "ohmetacache.hxx"
 #include "libupnpp/workqueue.hxx"
 #include "libupnpp/log.hxx"
+
+using namespace UPnPP;
 
 class SaveCacheTask {
 public: