diff --git a/src/mpl_stereo/AxesStereo.py b/src/mpl_stereo/AxesStereo.py
index b9987ec..9cfddba 100644
--- a/src/mpl_stereo/AxesStereo.py
+++ b/src/mpl_stereo/AxesStereo.py
@@ -366,7 +366,9 @@ def set_zlim(self,
         redraw : bool
             Whether to redraw the plot. If None, then will redraw.
         """
-        if redraw is None and (self.zlim != zlim or self.zscale != zscale):
+        if (redraw is None
+            and (self.zlim != zlim
+                 or (self.zscale != zscale and zscale is not None))):
             redraw = True
         self.zlim = zlim
         if zscale is not None:
diff --git a/tests/test_AxesStereo.py b/tests/test_AxesStereo.py
index b4fc028..7ea98ad 100644
--- a/tests/test_AxesStereo.py
+++ b/tests/test_AxesStereo.py
@@ -4,7 +4,7 @@
 from mpl_toolkits.mplot3d.axes3d import get_test_data
 
 from mpl_stereo import AxesStereo2D, AxesStereo3D, AxesAnaglyph
-from mpl_stereo.example_data import trefoil, sun_left_right
+from mpl_stereo.example_data import trefoil, sun_left_right, church_left_right
 
 
 def _testdata():
@@ -20,6 +20,10 @@ def _testdata():
     # Sun data
     sun_left_data, sun_right_data = sun_left_right()
     data['sun'] = (sun_left_data, sun_right_data)
+
+    # Church data
+    church_left_data, church_right_data = church_left_right()
+    data['church'] = (church_left_data, church_right_data)
     return data