diff --git a/ARGOS_service_data_converter.py b/ARGOS_service_data_converter.py
index 7154aa8..fb2fa4f 100755
--- a/ARGOS_service_data_converter.py
+++ b/ARGOS_service_data_converter.py
@@ -495,7 +495,7 @@ def pandas2netcdf(df=None, ofile="data.nc",isxa=True):
 
             xdf.to_netcdf(ofile,
                         format='NETCDF3_CLASSIC',
-                        encoding={'time':{'units':'days since 1900-01-01'}})
+                        encoding={'time':{'units':'days since 1900-01-01'},'checksum':{"dtype":"bool"}})
         else:
             df["time"] = [
                 date2num(x[1], "hours since 1900-01-01T00:00:00Z")