diff --git a/script/scan_guard.py b/script/scan_guard.py
index 184605ea..1acd5ccd 100644
--- a/script/scan_guard.py
+++ b/script/scan_guard.py
@@ -956,6 +956,9 @@ def operate():
 
 import argparse
 
+import _ca
+_ca.initialize()
+
 if True: #__name__ == '__main__':
     parser = argparse.ArgumentParser(
         description="Pause the measurements (scan records, Scienta detector) for beam loss")