diff --git a/lib/mpl_toolkits/mplot3d/axes3d.py b/lib/mpl_toolkits/mplot3d/axes3d.py
index 1406d8032a99..f8953369d9ef 100755
--- a/lib/mpl_toolkits/mplot3d/axes3d.py
+++ b/lib/mpl_toolkits/mplot3d/axes3d.py
@@ -14,7 +14,7 @@
 import math
 
 import six
-from six.moves import map, xrange, zip
+from six.moves import map, xrange, zip, reduce
 
 import warnings
 from operator import itemgetter