diff --git a/tsfm_public/toolkit/time_series_preprocessor.py b/tsfm_public/toolkit/time_series_preprocessor.py
index 369a9250..c0b9345d 100644
--- a/tsfm_public/toolkit/time_series_preprocessor.py
+++ b/tsfm_public/toolkit/time_series_preprocessor.py
@@ -127,6 +127,9 @@ def __init__(
         if not isinstance(id_columns, list):
             raise ValueError(f"Invalid argument provided for `id_columns`: {id_columns}")
 
+        if isinstance(timestamp_column, list):
+            raise ValueError(f"`timestamp_column` should not be a list, received: {timestamp_column}")
+
         self.id_columns = id_columns
         self.timestamp_column = timestamp_column
         self.target_columns = list(target_columns)