diff --git a/lib/mpl_toolkits/mplot3d/axes3d.py b/lib/mpl_toolkits/mplot3d/axes3d.py
index 65be58e1dd16..87fdc2bdf239 100644
--- a/lib/mpl_toolkits/mplot3d/axes3d.py
+++ b/lib/mpl_toolkits/mplot3d/axes3d.py
@@ -1916,7 +1916,7 @@ def bar(self, left, height, zs=0, zdir='z', *args, **kwargs):
             vs = art3d.get_patch_verts(p)
             verts += vs.tolist()
             verts_zs += [z] * len(vs)
-            art3d.patch_2d_to_3d(p, zs, zdir)
+            art3d.patch_2d_to_3d(p, z, zdir)
             if 'alpha' in kwargs:
                 p.set_alpha(kwargs['alpha'])