diff --git a/libs/canvas/canvas/canvas.h b/libs/canvas/canvas/canvas.h
index 387c6680cb..c7054e4c01 100644
--- a/libs/canvas/canvas/canvas.h
+++ b/libs/canvas/canvas/canvas.h
@@ -186,6 +186,9 @@ public:
 
 	bool get_mouse_position (Duple& winpos) const;
 
+	void set_single_exposure (bool s) { _single_exposure = s; }
+	bool single_exposure () { return _single_exposure; }
+
 	void re_enter ();
 
 	void start_tooltip_timeout (Item*);