diff --git a/lib/mpl_toolkits/mplot3d/axes3d.py b/lib/mpl_toolkits/mplot3d/axes3d.py
index a4069eb80ad6..73670692055b 100644
--- a/lib/mpl_toolkits/mplot3d/axes3d.py
+++ b/lib/mpl_toolkits/mplot3d/axes3d.py
@@ -1522,10 +1522,10 @@ def plot(self, xs, ys, *args, **kwargs):
'''
had_data = self.has_data()
- # `zs` can be passed positionally or as keyword; checking with
- # `_is_string_like` matches the behavior of 2D `plot` (via
+ # `zs` can be passed positionally or as keyword; checking whether
+ # args[0] is a string matches the behavior of 2D `plot` (via
# `_process_plot_var_args`).
- if args and not cbook.is_string_like(args[0]):
+ if args and not isinstance(args[0], six.string_types):
zs = args[0]
args = args[1:]
if 'zs' in kwargs:
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