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--- a/libupnpp/upnpp_p.hxx
+++ b/libupnpp/upnpp_p.hxx
@@ -24,6 +24,8 @@
 
 #include <string>
 
+namespace UPnPP {
+
 // Concatenate paths. Caller should make sure it makes sense.
 extern std::string caturl(const std::string& s1, const std::string& s2);
 // Return the scheme://host:port[/] part of input, or input if it is weird
@@ -40,4 +42,6 @@
 // Case-insensitive ascii string compare where s1 is already upper-case
 int stringuppercmp(const std::string &s1, const std::string& s2);
 
+} // namespace
+
 #endif /* _UPNPP_H_X_INCLUDED_ */