diff --git a/rtgui/histogrampanel.cc b/rtgui/histogrampanel.cc
index c810145e9..1d8ce89db 100644
--- a/rtgui/histogrampanel.cc
+++ b/rtgui/histogrampanel.cc
@@ -312,18 +312,17 @@ void HistogramPanel::setHistRGBInvalid ()
     histogramRGBArea->queue_draw ();
 }
 
-void HistogramPanel::pointerMoved (bool validPos, Glib::ustring profile, Glib::ustring profileW, int x, int y, int r, int g, int b)
+void HistogramPanel::pointerMoved (bool validPos, const Glib::ustring &profile, const Glib::ustring &profileW, int x, int y, int r, int g, int b, bool isRaw)
 {
 
     if (!validPos) {
         // do something to un-show vertical bars
         histogramRGBArea->updateBackBuffer(-1, -1, -1);
-        histogramRGBArea->queue_draw ();
     } else {
         // do something to show vertical bars
         histogramRGBArea->updateBackBuffer(r, g, b, profile, profileW);
-        histogramRGBArea->queue_draw ();
     }
+    histogramRGBArea->queue_draw ();
 }
 
 /*
diff --git a/rtgui/histogrampanel.h b/rtgui/histogrampanel.h
index 990d67a52..d3788d057 100644
--- a/rtgui/histogrampanel.h
+++ b/rtgui/histogrampanel.h
@@ -213,7 +213,8 @@ public:
         histogramArea->update (histRed, histGreen, histBlue, histLuma, histRedRaw, histGreenRaw, histBlueRaw, histChroma);
     }
     // pointermotionlistener interface
-    void pointerMoved (bool validPos, Glib::ustring profile, Glib::ustring profileW, int x, int y, int r, int g, int b);
+    void pointerMoved (bool validPos, const Glib::ustring &profile, const Glib::ustring &profileW, int x, int y, int r, int g, int b, bool isRaw = false);
+
     // TODO should be protected
     void setHistRGBInvalid ();
 
diff --git a/rtgui/pointermotionlistener.h b/rtgui/pointermotionlistener.h
index c090d5114..88a4b2279 100644
--- a/rtgui/pointermotionlistener.h
+++ b/rtgui/pointermotionlistener.h
@@ -27,7 +27,7 @@ protected:
 
 public:
     virtual ~PointerMotionListener() {}
-    virtual void pointerMoved (bool validPos, const Glib::ustring &profile, const Glib::ustring &profileW, int x, int y, int r, int g, int b, bool isRaw = false) {}
+    virtual void pointerMoved (bool validPos, const Glib::ustring &profile, const Glib::ustring &profileW, int x, int y, int r, int g, int b, bool isRaw = false) = 0;
     virtual void getRGBText (int r, int g, int b, Glib::ustring &sR, Glib::ustring &sG, Glib::ustring &sB, bool isRaw = false) { sR = "--"; sG = "--"; sB = "--"; }
     virtual void getHSVText (float h, float s, float v, Glib::ustring &sH, Glib::ustring &sS, Glib::ustring &sV) { sH = "--"; sS = "--"; sV = "--"; }
     virtual void getLABText (float l, float a, float b, Glib::ustring &sL, Glib::ustring &sA, Glib::ustring &sB) { sL = "--"; sA = "--"; sB = "--"; }