diff --git a/global_checks.py b/global_checks.py
index e51633d36d3457270473c5974759be4a0d478ea6..3bc5950a287f13cbc3be62291b4490d4283af2f4 100644
--- a/global_checks.py
+++ b/global_checks.py
@@ -1,6 +1,9 @@
 from util import BaseCheckList
 
 def check_missing_data_flag(frame, parameters):
+    if 'missingDataFlag' not in frame:
+        return frame
+    frame['check_missing_data_flag'] = (frame['missingDataFlag'] == 1)*1
     return frame
 
 class CheckList(BaseCheckList):