diff --git a/skimage/morphology/selem.py b/skimage/morphology/selem.py
index b7b65d72..1822c8b3 100644
--- a/skimage/morphology/selem.py
+++ b/skimage/morphology/selem.py
@@ -312,3 +312,9 @@ def _default_selem(ndim):
     """
     return ndimage.morphology.generate_binary_structure(ndim, 1)
 
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