diff --git a/openflexure_microscope/rescue/check_sangaboard.py b/openflexure_microscope/rescue/check_sangaboard.py
index 13470ed2..8c7f6aa7 100644
--- a/openflexure_microscope/rescue/check_sangaboard.py
+++ b/openflexure_microscope/rescue/check_sangaboard.py
@@ -1,4 +1,4 @@
-from .error_sources import ErrorSource, WarningSource
+from .error_sources import ErrorSource
 
 from openflexure_microscope.config import user_configuration