--- a/plugins/codec_mp3/MP3Encoder.h
+++ b/plugins/codec_mp3/MP3Encoder.h
@@ -27,6 +27,8 @@
 #include <QProcess>
 
 #include "libkwave/Encoder.h"
+
+#include "ID3_PropertyMap.h"
 
 class ID3_Tag;
 class QIODevice;
@@ -81,6 +83,9 @@
 
     private:
 
+	/** property - to - ID3 mapping */
+	ID3_PropertyMap m_property_map;
+
 	/** lock for protecting m_dst and m_process */
 	QMutex m_lock;