diff --git a/openml/datasets/functions.py b/openml/datasets/functions.py
index 432938520..3f482612c 100644
--- a/openml/datasets/functions.py
+++ b/openml/datasets/functions.py
@@ -456,7 +456,7 @@ def get_dataset(  # noqa: C901, PLR0912
 
     if cache_format not in ["feather", "pickle"]:
         raise ValueError(
-            "cache_format must be one of 'feather' or 'pickle. "
+            "cache_format must be one of 'feather' or 'pickle'. "
             f"Invalid format specified: {cache_format}",
         )