diff --git a/skimage/viewer/canvastools/recttool.py b/skimage/viewer/canvastools/recttool.py
index ce81c38d..41e9ab1e 100644
--- a/skimage/viewer/canvastools/recttool.py
+++ b/skimage/viewer/canvastools/recttool.py
@@ -55,7 +55,7 @@ class RectangleTool(CanvasToolBase, RectangleSelector):
             self.disconnect_events()
         except AttributeError:
             # disconnect the events manually (hack for older mpl verions)
-            [self.canvas.mpl_disconnect(i) for i in range(5)]
+            [self.canvas.mpl_disconnect(i) for i in range(10)]
 
         # Alias rectangle attribute, which is initialized in RectangleSelector.
         self._rect = self.to_draw