diff --git a/openflexure_microscope/api/app.py b/openflexure_microscope/api/app.py
index 8d4ca70c..4a8556d3 100644
--- a/openflexure_microscope/api/app.py
+++ b/openflexure_microscope/api/app.py
@@ -23,7 +23,7 @@ from flask_cors import CORS
 from openflexure_microscope.api.utilities import list_routes
 
 from openflexure_microscope import Microscope, config
-from openflexure_microscope.lock import LockError
+from openflexure_microscope.exceptions import LockError
 from openflexure_microscope.camera.pi import StreamingCamera
 from openflexure_microscope.stage.openflexure import Stage