diff --git a/rtgui/editorpanel.cc b/rtgui/editorpanel.cc
index 205cf2bf2..ab7aa873d 100644
--- a/rtgui/editorpanel.cc
+++ b/rtgui/editorpanel.cc
@@ -48,6 +48,8 @@
 
 using namespace rtengine::procparams;
 
+using ScopeType = Options::ScopeType;
+
 namespace
 {
 
diff --git a/rtgui/editorpanel.h b/rtgui/editorpanel.h
index abfcb0a8f..a277ffd3a 100644
--- a/rtgui/editorpanel.h
+++ b/rtgui/editorpanel.h
@@ -151,7 +151,7 @@ public:
     bool updateWaveform(void) const override;
 
     // HistogramPanelListener
-    void scopeTypeChanged(ScopeType new_type) override;
+    void scopeTypeChanged(Options::ScopeType new_type) override;
 
     // event handlers
     void info_toggled ();
@@ -286,5 +286,5 @@ private:
     IdleRegister idle_register;
 
     rtengine::HistogramObservable* histogram_observable;
-    ScopeType histogram_scope_type;
+    Options::ScopeType histogram_scope_type;
 };
diff --git a/rtgui/histogrampanel.cc b/rtgui/histogrampanel.cc
index 23d443aea..41605d638 100644
--- a/rtgui/histogrampanel.cc
+++ b/rtgui/histogrampanel.cc
@@ -29,6 +29,7 @@
 
 using namespace rtengine;
 
+using ScopeType = Options::ScopeType;
 
 //
 //
diff --git a/rtgui/histogrampanel.h b/rtgui/histogrampanel.h
index 980a56f4f..4417e2373 100644
--- a/rtgui/histogrampanel.h
+++ b/rtgui/histogrampanel.h
@@ -37,8 +37,6 @@
 
 class HistogramArea;
 
-using ScopeType = Options::ScopeType;
-
 struct HistogramAreaIdleHelper {
     HistogramArea* harea;
     bool destroyed;
@@ -175,7 +173,7 @@ protected:
     bool valid;
     int drawMode;
     DrawModeListener *myDrawModeListener;
-    ScopeType scopeType;
+    Options::ScopeType scopeType;
     int oldwidth, oldheight;
     /// Intensity of waveform and vectorscope trace.
     float trace_brightness;
@@ -217,7 +215,7 @@ public:
         const array2D<int>& waveformBlue,
         const array2D<int>& waveformLuma
     );
-    void updateOptions (bool r, bool g, bool b, bool l, bool c, int mode, ScopeType type, bool pointer);
+    void updateOptions (bool r, bool g, bool b, bool l, bool c, int mode, Options::ScopeType type, bool pointer);
     bool updatePending();
     void on_realize() override;
     bool on_draw(const ::Cairo::RefPtr< Cairo::Context> &cr) override;
@@ -241,7 +239,7 @@ private:
 class HistogramPanelListener
 {
 public:
-    virtual void scopeTypeChanged(ScopeType new_type) = 0;
+    virtual void scopeTypeChanged(Options::ScopeType new_type) = 0;
 };
 
 class HistogramPanel final : public Gtk::Grid, public PointerMotionListener, public DrawModeListener, public rtengine::NonCopyable
diff --git a/rtgui/options.cc b/rtgui/options.cc
index 06726452e..d71fcc57d 100644
--- a/rtgui/options.cc
+++ b/rtgui/options.cc
@@ -2266,7 +2266,7 @@ void Options::saveToFile(Glib::ustring fname)
         keyFile.set_boolean("GUI", "HistogramBar", histogramBar);
         keyFile.set_integer("GUI", "HistogramHeight", histogramHeight);
         keyFile.set_integer("GUI", "HistogramDrawMode", histogramDrawMode);
-        keyFile.set_integer("GUI", "HistogramScopeType", histogramScopeType);
+        keyFile.set_integer("GUI", "HistogramScopeType", rtengine::toUnderlying(histogramScopeType));
         keyFile.set_boolean("GUI", "HistogramShowScopeButtons", histogramShowScopeButtons);
         keyFile.set_integer("GUI", "NavigatorRGBUnit", (int)navRGBUnit);
         keyFile.set_integer("GUI", "NavigatorHSVUnit", (int)navHSVUnit);
diff --git a/rtgui/options.h b/rtgui/options.h
index 4bc4ccc42..e64c31ad1 100644
--- a/rtgui/options.h
+++ b/rtgui/options.h
@@ -168,13 +168,22 @@ private:
                      const Glib::ustring& entryName, Glib::ustring& destination);
 
 public:
-
     enum class NavigatorUnit {
         PERCENT,
         R0_255,
         R0_1,
         _COUNT
     };
+
+    enum class ScopeType {
+        NONE = -1,
+        HISTOGRAM,
+        HISTOGRAM_RAW,
+        VECTORSCOPE_HC,
+        VECTORSCOPE_HS,
+        WAVEFORM
+    };
+
     bool savesParamsAtExit;
     SaveFormat saveFormat, saveFormatBatch;
     Glib::ustring savePathTemplate;
@@ -306,15 +315,6 @@ public:
     double sndLngEditProcDoneSecs;  // Minimum processing time seconds till the sound is played
     bool sndEnable;
 
-    enum ScopeType
-    {
-        HISTOGRAM = 0,
-        HISTOGRAM_RAW = 1,
-        VECTORSCOPE_HC = 2,
-        VECTORSCOPE_HS = 3,
-        WAVEFORM = 4,
-        NONE = -1
-    };
     int histogramPosition;  // 0=disabled, 1=left pane, 2=right pane
     bool histogramRed, histogramGreen, histogramBlue;
     bool histogramLuma, histogramChroma;