diff --git a/cdsobs/data/insitu-observations-ndacc/service_definition.yml b/cdsobs/data/insitu-observations-ndacc/service_definition.yml
index c1bbd9d..7894428 100644
--- a/cdsobs/data/insitu-observations-ndacc/service_definition.yml
+++ b/cdsobs/data/insitu-observations-ndacc/service_definition.yml
@@ -934,11 +934,11 @@ sources:
         units: '1'
       ozone_number_density_altitude_resolution_df_transfer_function:
         description: Transfer Function of Digital Filter used.
-        dtype: float32
+        dtype: object
         units: '1'
       ozone_number_density_altitude_resolution_distance_from_impulse:
         description: Distance from impulse to use with Impulse Response (0 at location of Impulse).
-        dtype: float32
+        dtype: object
         units: '1'
       ozone_number_density_altitude_resolution_impulse_response:
         description: 'Vertical resolution: impulse response.'
diff --git a/tests/scripts/upgrade_service_definition.py b/tests/scripts/upgrade_service_definition.py
index 992b393..6e41a99 100644
--- a/tests/scripts/upgrade_service_definition.py
+++ b/tests/scripts/upgrade_service_definition.py
@@ -502,6 +502,9 @@ def get_dtype(cdm_name) -> str:
         "methane_total_column_averaging_kernel",
         "carbon_monoxide_total_column_averaging_kernel",
         "carbon_monoxide_volume_mixing_ratio_averaging_kernel",
+        "ozone_number_density_altitude_resolution_df_transfer_function",
+        "ozone_number_density_altitude_resolution_distance_from_impulse",
+        "air_pressure_source",
     ]
     vars_datetime = [
         "report_timestamp",