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--- a/libupnpp/md5.cxx
+++ b/libupnpp/md5.cxx
@@ -32,7 +32,12 @@
 #include <stdio.h>
 #include <string.h>
 
+#include <string>
+using namespace std;
+
 #include "md5.hxx"
+
+namespace UPnPP {
 
 typedef unsigned int md5uint32;
 
@@ -364,3 +369,5 @@
     }
     return digest;
 }
+
+}