diff --git a/rtgui/guiutils.cc b/rtgui/guiutils.cc
index 7e36441fb..cb99b04a5 100644
--- a/rtgui/guiutils.cc
+++ b/rtgui/guiutils.cc
@@ -1989,7 +1989,7 @@ Gtk::Label SpotPicker::labelSetup(Glib::ustring const &key) const
     return label;
 }
 
-MyComboBoxText SpotPicker::selecterSetup()
+MyComboBoxText SpotPicker::selecterSetup() const
 {
     MyComboBoxText spotSize = MyComboBoxText();
     setExpandAlignProperties(&spotSize, false, false, Gtk::ALIGN_START, Gtk::ALIGN_CENTER);
@@ -2025,7 +2025,7 @@ MyComboBoxText SpotPicker::selecterSetup()
     return spotSize;
 }
 
-Gtk::ToggleButton SpotPicker::spotButtonTemplate(Glib::ustring const &key, const Glib::ustring &tooltip)
+Gtk::ToggleButton SpotPicker::spotButtonTemplate(Glib::ustring const &key, const Glib::ustring &tooltip) const
 {
     Gtk::ToggleButton spotButton = Gtk::ToggleButton(key);
     setExpandAlignProperties(&spotButton, true, false, Gtk::ALIGN_FILL, Gtk::ALIGN_CENTER);
diff --git a/rtgui/guiutils.h b/rtgui/guiutils.h
index 9683899f0..221a56814 100644
--- a/rtgui/guiutils.h
+++ b/rtgui/guiutils.h
@@ -728,7 +728,7 @@ class SpotPicker : public Gtk::Grid
         Gtk::ToggleButton _spotButton;
     public:
         SpotPicker(int const defaultValue, Glib::ustring const &buttonKey, Glib::ustring const &buttonTooltip, Glib::ustring const &labelKey);
-        inline bool get_active()
+        inline bool get_active() const
         {
             return _spotButton.get_active();
         }
@@ -736,7 +736,7 @@ class SpotPicker : public Gtk::Grid
         {
             _spotButton.set_active(b);
         }
-        int get_spot_half_width()
+        int get_spot_half_width() const
         {
             return _spotHalfWidth;
         }
@@ -751,8 +751,8 @@ class SpotPicker : public Gtk::Grid
 
     protected:
         Gtk::Label labelSetup(Glib::ustring const &key) const;
-        MyComboBoxText selecterSetup();
-        static Gtk::ToggleButton spotButtonTemplate(Glib::ustring const &key, const Glib::ustring &tooltip);
+        MyComboBoxText selecterSetup() const;
+        Gtk::ToggleButton spotButtonTemplate(Glib::ustring const &key, const Glib::ustring &tooltip) const;
         void spotSizeChanged();
 };