diff --git a/Jamulus.pro b/Jamulus.pro
index 2165d5f5..5fa7de19 100755
--- a/Jamulus.pro
+++ b/Jamulus.pro
@@ -174,9 +174,7 @@ HEADERS += src/audiomixerboard.h \
     src/recorder/jamrecorder.h \
     src/recorder/creaperproject.h \
     src/recorder/cwavestream.h \
-    src/historygraph.h \
-    src/jpeghistorygraph.h \
-    src/svghistorygraph.h
+    src/historygraph.h
 
 HEADERS_OPUS = libs/opus/include/opus.h \
     libs/opus/include/opus_multistream.h \
diff --git a/src/historygraph.h b/src/historygraph.h
index 49f45568..198bcd4b 100644
--- a/src/historygraph.h
+++ b/src/historygraph.h
@@ -9,11 +9,19 @@
 #include "global.h"
 #include "util.h"
 
+// for CJpegHistoryGraph
+#include <QImage>
+#include <QPainter>
+
+// for CSvgHistoryGraph
+#include <QXmlStreamWriter>
+#include <QXmlStreamAttributes>
+
 /* Definitions ****************************************************************/
 // number of history items to store
 #define NUM_ITEMS_HISTORY           600
 
-/* Interface ********************************************************************/
+/* Interface ******************************************************************/
 class AHistoryGraph
 {
 public:
@@ -97,4 +105,54 @@ protected:
     QTimer TimerDailyUpdate;
 };
 
+/* Implementations ************************************************************/
+class CJpegHistoryGraph : public QObject, virtual public AHistoryGraph
+{
+    Q_OBJECT
+
+public:
+    CJpegHistoryGraph();
+    virtual void Update ( );
+
+protected:
+    virtual void Save ( const QString sFileName );
+
+    virtual void rect ( const unsigned int x, const unsigned int y, const unsigned int width, const unsigned int height );
+    virtual void text ( const unsigned int x, const unsigned int y, const QString& value );
+    virtual void line ( const unsigned int x1, const unsigned int y1, const unsigned int x2, const unsigned int y2, const unsigned int strokeWidth = 1 );
+    virtual void point ( const unsigned int x, const unsigned int y, const unsigned int size, const QString& colour );
+
+private:
+    QImage PlotPixmap;
+    int iAxisFontWeight;
+
+public slots:
+    void OnTimerDailyUpdate() { Update(); }
+};
+
+class CSvgHistoryGraph : public QObject, virtual public AHistoryGraph
+{
+    Q_OBJECT
+
+public:
+    CSvgHistoryGraph();
+    virtual void Update();
+
+protected:
+    virtual void Save ( const QString sFileName );
+
+    virtual void rect ( const unsigned int x, const unsigned int y, const unsigned int width, const unsigned int height );
+    virtual void text ( const unsigned int x, const unsigned int y, const QString& value );
+    virtual void line ( const unsigned int x1, const unsigned int y1, const unsigned int x2, const unsigned int y2, const unsigned int strokeWidth = 1 );
+    virtual void point ( const unsigned int x, const unsigned int y, const unsigned int size, const QString& colour );
+
+private:
+    QXmlStreamAttributes svgRootAttributes;
+    QString svgImage;
+    QXmlStreamWriter svgStreamWriter;
+
+public slots:
+    void OnTimerDailyUpdate() { Update(); }
+};
+
 #endif // HISTORYGRAPH_H
diff --git a/src/jpeghistorygraph.cpp b/src/jpeghistorygraph.cpp
index 41b1391f..14dc0d6f 100644
--- a/src/jpeghistorygraph.cpp
+++ b/src/jpeghistorygraph.cpp
@@ -1,4 +1,4 @@
-#include "jpeghistorygraph.h"
+#include "historygraph.h"
 
 CJpegHistoryGraph::CJpegHistoryGraph() :
     AHistoryGraph(),
diff --git a/src/jpeghistorygraph.h b/src/jpeghistorygraph.h
deleted file mode 100755
index f4dd3c88..00000000
--- a/src/jpeghistorygraph.h
+++ /dev/null
@@ -1,34 +0,0 @@
-#ifndef JPEGHISTORYGRAPH_H
-#define JPEGHISTORYGRAPH_H
-
-#include "historygraph.h"
-
-#include <QImage>
-#include <QPainter>
-
-/* Classes ********************************************************************/
-class CJpegHistoryGraph : public QObject, virtual public AHistoryGraph
-{
-    Q_OBJECT
-
-public:
-    CJpegHistoryGraph();
-    virtual void Update ( );
-
-protected:
-    virtual void Save ( const QString sFileName );
-
-    virtual void rect ( const unsigned int x, const unsigned int y, const unsigned int width, const unsigned int height );
-    virtual void text ( const unsigned int x, const unsigned int y, const QString& value );
-    virtual void line ( const unsigned int x1, const unsigned int y1, const unsigned int x2, const unsigned int y2, const unsigned int strokeWidth = 1 );
-    virtual void point ( const unsigned int x, const unsigned int y, const unsigned int size, const QString& colour );
-
-private:
-    QImage PlotPixmap;
-    int iAxisFontWeight;
-
-public slots:
-    void OnTimerDailyUpdate() { Update(); }
-};
-
-#endif // JPEGHISTORYGRAPH_H
diff --git a/src/serverlogging.h b/src/serverlogging.h
index 649bbdd5..a8fb8386 100755
--- a/src/serverlogging.h
+++ b/src/serverlogging.h
@@ -33,8 +33,7 @@
 #include "global.h"
 #include "util.h"
 
-#include "jpeghistorygraph.h"
-#include "svghistorygraph.h"
+#include "historygraph.h"
 
 /* Classes ********************************************************************/
 class CServerLogging
diff --git a/src/svghistorygraph.cpp b/src/svghistorygraph.cpp
index d5287320..fa364d2a 100755
--- a/src/svghistorygraph.cpp
+++ b/src/svghistorygraph.cpp
@@ -1,4 +1,4 @@
-#include "svghistorygraph.h"
+#include "historygraph.h"
 
 CSvgHistoryGraph::CSvgHistoryGraph() :
     AHistoryGraph(),
diff --git a/src/svghistorygraph.h b/src/svghistorygraph.h
deleted file mode 100755
index 86ce4f83..00000000
--- a/src/svghistorygraph.h
+++ /dev/null
@@ -1,41 +0,0 @@
-#ifndef SVGHISTORYGRAPH_H
-#define SVGHISTORYGRAPH_H
-
-#include "historygraph.h"
-
-#include <QXmlStreamWriter>
-#include <QXmlStreamAttributes>
-
-/* Definitions ****************************************************************/
-// number of history items to store
-#ifndef NUM_ITEMS_HISTORY
-#define NUM_ITEMS_HISTORY           600
-#endif
-
-/* Classes ********************************************************************/
-class CSvgHistoryGraph : public QObject, virtual public AHistoryGraph
-{
-    Q_OBJECT
-
-public:
-    CSvgHistoryGraph();
-    virtual void Update();
-
-protected:
-    virtual void Save ( const QString sFileName );
-
-    virtual void rect ( const unsigned int x, const unsigned int y, const unsigned int width, const unsigned int height );
-    virtual void text ( const unsigned int x, const unsigned int y, const QString& value );
-    virtual void line ( const unsigned int x1, const unsigned int y1, const unsigned int x2, const unsigned int y2, const unsigned int strokeWidth = 1 );
-    virtual void point ( const unsigned int x, const unsigned int y, const unsigned int size, const QString& colour );
-
-private:
-    QXmlStreamAttributes svgRootAttributes;
-    QString svgImage;
-    QXmlStreamWriter svgStreamWriter;
-
-public slots:
-    void OnTimerDailyUpdate() { Update(); }
-};
-
-#endif // SVGHISTORYGRAPH_H