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--- a/libupnpp/upnpavutils.cxx
+++ b/libupnpp/upnpavutils.cxx
@@ -18,6 +18,8 @@
 using namespace std;
 
 #include "libupnpp/upnpavutils.hxx"
+
+namespace UPnPP {
 
 // Format duration in milliseconds into UPnP duration format
 string upnpduration(int ms)
@@ -48,3 +50,5 @@
     }
     return 3600 * hours + 60 * minutes + seconds;
 }
+
+}