diff --git a/openflexure_microscope/plugins/default/autofocus/plugin.py b/openflexure_microscope/plugins/default/autofocus/plugin.py
index 78a0ac10..e11b08f6 100644
--- a/openflexure_microscope/plugins/default/autofocus/plugin.py
+++ b/openflexure_microscope/plugins/default/autofocus/plugin.py
@@ -45,7 +45,7 @@ class AutofocusPlugin(MicroscopePlugin):
                 sharpnesses.append(self.measure_sharpness(metric_fn))
 
             newposition = positions[np.argmax(sharpnesses)]
-            stage.focus_rel(newposition - stage.position[2])
+            stage.move_rel([0, 0, newposition - stage.position[2]])
 
         return positions, sharpnesses