diff --git a/geomagio/processing/magproc.py b/geomagio/processing/magproc.py
index 604a9826fd7b6db85120f551c52c1e8f1e083e6e..dd5e177f01f6a422b34144a9eab46b28c7489d7e 100644
--- a/geomagio/processing/magproc.py
+++ b/geomagio/processing/magproc.py
@@ -137,6 +137,7 @@ def write_cal_file(
             endtime=endtime,
             station=observatory,
             status="reviewed",
+            data_valid=True,
         )
         metadata = factory.get_metadata(query=query)
         # convert returned metadata.metadata into Reading objects