diff --git a/CEP/Calibration/BBSControl/scripts/addImagingColumns.py b/CEP/Calibration/BBSControl/scripts/addImagingColumns.py
index cd4b11772cdabe7ef497e9aef31464ba96c6f70c..ebe1d0fa6fac67fe9c4c18439d0ff65bac54f388 100755
--- a/CEP/Calibration/BBSControl/scripts/addImagingColumns.py
+++ b/CEP/Calibration/BBSControl/scripts/addImagingColumns.py
@@ -13,7 +13,7 @@ try:
 except ImportError:
   print "addImagingColumns.py: could not import pyrap.tables"
   print "WARN: No imaging columns added"
-  sys.exit(0)
+  sys.exit(1)
 
 if len(sys.argv)> 2:
   print "addImagingColumns.py: Too many arguments"