diff --git a/skimage/morphology/binary.py b/skimage/morphology/binary.py
index 7262c573..4a7b1578 100644
--- a/skimage/morphology/binary.py
+++ b/skimage/morphology/binary.py
@@ -1,5 +1,4 @@
 import numpy as np
-import warnings
 from scipy import ndimage