diff --git a/lib/mpl_toolkits/mplot3d/art3d.py b/lib/mpl_toolkits/mplot3d/art3d.py
index 8b0669775eaf..5c1825b255b2 100644
--- a/lib/mpl_toolkits/mplot3d/art3d.py
+++ b/lib/mpl_toolkits/mplot3d/art3d.py
@@ -172,7 +172,7 @@ def __init__(self, xs, ys, zs, *args, **kwargs):
     def set_3d_properties(self, zs=0, zdir='z'):
         xs = self.get_xdata()
         ys = self.get_ydata()
-        zs = np.broadcast_to(zs, xs.shape)
+        zs = np.broadcast_to(zs, len(xs))
         self._verts3d = juggle_axes(xs, ys, zs, zdir)
         self.stale = True
 
diff --git a/lib/mpl_toolkits/tests/test_mplot3d.py b/lib/mpl_toolkits/tests/test_mplot3d.py
index ae8e91ddc24d..e8064e0b839d 100644
--- a/lib/mpl_toolkits/tests/test_mplot3d.py
+++ b/lib/mpl_toolkits/tests/test_mplot3d.py
@@ -1119,6 +1119,12 @@ def test_line3d_set_get_data_3d():
     np.testing.assert_array_equal((x, y, z), line.get_data_3d())
     line.set_data_3d(x2, y2, z2)
     np.testing.assert_array_equal((x2, y2, z2), line.get_data_3d())
+    line.set_xdata(x)
+    line.set_ydata(y)
+    line.set_3d_properties(zs=z, zdir='z')
+    np.testing.assert_array_equal((x, y, z), line.get_data_3d())
+    line.set_3d_properties(zs=0, zdir='z')
+    np.testing.assert_array_equal((x, y, np.zeros_like(z)), line.get_data_3d())
 
 
 @check_figures_equal(extensions=["png"])