diff --git a/openflexure_microscope/rescue/check_settings.py b/openflexure_microscope/rescue/check_settings.py
index 6ca7d0c1..26203a32 100644
--- a/openflexure_microscope/rescue/check_settings.py
+++ b/openflexure_microscope/rescue/check_settings.py
@@ -4,8 +4,6 @@ from typing import List
 
 from .error_sources import ErrorSource
 
-ERROR_SOURCES: List[ErrorSource] = []
-
 
 def trace_config_exceptions():
     error_sources = []