diff --git a/src/ert/storage/migration/to7.py b/src/ert/storage/migration/to7.py
index cb34c33942e..dc398300f89 100644
--- a/src/ert/storage/migration/to7.py
+++ b/src/ert/storage/migration/to7.py
@@ -233,6 +233,13 @@ def _migrate_responses_from_netcdf_to_parquet(path: Path) -> None:
 
                         pandas_df = gen_data_ds.to_dataframe().dropna()
                         polars_df = polars.from_pandas(pandas_df.reset_index())
+                        polars_df.rename({"name": "response_key"})
+
+                        if "time" in polars_df:
+                            polars_df = polars_df.with_columns(
+                                polars.col("time").dt.cast_time_unit("ms")
+                            )
+
                         polars_df.write_parquet(real_dir / f"{ds_name}.parquet")
 
                         os.remove(real_dir / f"{ds_name}.nc")