--- a/libupnpp/control/ohplaylist.hxx
+++ b/libupnpp/control/ohplaylist.hxx
@@ -17,15 +17,20 @@
#ifndef _OHPLAYLIST_HXX_INCLUDED_
#define _OHPLAYLIST_HXX_INCLUDED_
-#include <string>
-#include <memory>
+#include <memory> // for shared_ptr
+#include <string> // for string
+#include <unordered_map> // for unordered_map
+#include <vector> // for vector
-#include "service.hxx"
-#include "cdircontent.hxx"
+#include "cdircontent.hxx" // for UPnPDirObject
+#include "service.hxx" // for Service
+
+namespace UPnPClient { class OHPlaylist; }
+namespace UPnPClient { class UPnPDeviceDesc; }
+namespace UPnPClient { class UPnPServiceDesc; }
namespace UPnPClient {
-class OHPlaylist;
typedef std::shared_ptr<OHPlaylist> OHPLH;
/**