5 files changed, 9 insertions, 9 deletions
diff --git a/src/ui/widget/color-notebook.h b/src/ui/widget/color-notebook.h
index 0948e3d46..7c43435d3 100644
--- a/src/ui/widget/color-notebook.h
+++ b/src/ui/widget/color-notebook.h
@@ -70,8 +70,8 @@ protected:
 
 private:
     // By default, disallow copy constructor and assignment operator
-    ColorNotebook(const ColorNotebook &obj);
-    ColorNotebook &operator=(const ColorNotebook &obj);
+    ColorNotebook(const ColorNotebook &obj) = delete;
+    ColorNotebook &operator=(const ColorNotebook &obj) = delete;
 };
 }
 }
diff --git a/src/ui/widget/color-scales.h b/src/ui/widget/color-scales.h
index 1fc465418..5d681cdfb 100644
--- a/src/ui/widget/color-scales.h
+++ b/src/ui/widget/color-scales.h
@@ -71,8 +71,8 @@ protected:
 
 private:
     // By default, disallow copy constructor and assignment operator
-    ColorScales(ColorScales const &obj);
-    ColorScales &operator=(ColorScales const &obj);
+    ColorScales(ColorScales const &obj) = delete;
+    ColorScales &operator=(ColorScales const &obj) = delete;
 };
 
 class ColorScalesFactory : public Inkscape::UI::ColorSelectorFactory
diff --git a/src/ui/widget/color-wheel-selector.h b/src/ui/widget/color-wheel-selector.h
index ee7bd9b83..db9f7746b 100644
--- a/src/ui/widget/color-wheel-selector.h
+++ b/src/ui/widget/color-wheel-selector.h
@@ -59,8 +59,8 @@ protected:
 
 private:
     // By default, disallow copy constructor and assignment operator
-    ColorWheelSelector(const ColorWheelSelector &obj);
-    ColorWheelSelector &operator=(const ColorWheelSelector &obj);
+    ColorWheelSelector(const ColorWheelSelector &obj) = delete;
+    ColorWheelSelector &operator=(const ColorWheelSelector &obj) = delete;
 
     sigc::connection _color_changed_connection;
     sigc::connection _color_dragged_connection;
diff --git a/src/ui/widget/dock-item.h b/src/ui/widget/dock-item.h
index 31cdcf080..2b69fab45 100644
--- a/src/ui/widget/dock-item.h
+++ b/src/ui/widget/dock-item.h
@@ -141,7 +141,7 @@ private:
 
     sigc::signal<void, State, State> _signal_state_changed;
 
-    DockItem();
+    DockItem() = delete;
 };
 
 } // namespace Widget
diff --git a/src/ui/widget/spinbutton.h b/src/ui/widget/spinbutton.h
index ae571994b..9c015a3b2 100644
--- a/src/ui/widget/spinbutton.h
+++ b/src/ui/widget/spinbutton.h
@@ -89,8 +89,8 @@ protected:
 
 private:
   // noncopyable
-  SpinButton(const SpinButton&);
-  SpinButton& operator=(const SpinButton&);
+  SpinButton(const SpinButton&) = delete;
+  SpinButton& operator=(const SpinButton&) = delete;
 };
 
 } // namespace Widget