diff --git a/runtime/databricks/automl_runtime/forecast/pmdarima/training.py b/runtime/databricks/automl_runtime/forecast/pmdarima/training.py
index a3f6ba8a..88233961 100644
--- a/runtime/databricks/automl_runtime/forecast/pmdarima/training.py
+++ b/runtime/databricks/automl_runtime/forecast/pmdarima/training.py
@@ -138,7 +138,7 @@ def _fit_predict(self, df: pd.DataFrame, cutoffs: List[pd.Timestamp], seasonal_p
     @staticmethod
     def _fill_missing_time_steps(df: pd.DataFrame, frequency: str):
         # Forward fill missing time steps
-        df_filled = df.set_index("ds").resample(rule=OFFSET_ALIAS_MAP[frequency]).pad().reset_index()
+        df_filled = df.set_index("ds").resample(rule=OFFSET_ALIAS_MAP[frequency]).ffill().reset_index()
         start_ds, modified_start_ds = df["ds"].min(), df_filled["ds"].min()
         if start_ds != modified_start_ds:
             offset = modified_start_ds - start_ds