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--- a/libupnpp/cdirectory.hxx
+++ b/libupnpp/cdirectory.hxx
@@ -70,7 +70,7 @@
     static bool getServices(std::vector<ContentDirectoryService>&);
 
     /** Retrieve specific service designated by its friendlyName */
-    static bool getServerByName(const string& friendlyName, 
+    static bool getServerByName(const std::string& friendlyName, 
                                 ContentDirectoryService& server);
 
     /** Read a full container's children list 
@@ -135,7 +135,7 @@
     int getSearchCapabilities(std::set<std::string>& result);
 
     // The service type string for Content Directories:
-    static const string SType;
+    static const std::string SType;
 
 private:
     int m_rdreqcnt; // Slice size to use when reading