diff --git a/library/config_util.py b/library/config_util.py
index af4eedaa..ab90fb63 100644
--- a/library/config_util.py
+++ b/library/config_util.py
@@ -51,7 +51,7 @@ class BaseSubsetParams:
   image_dir: Optional[str] = None
   num_repeats: int = 1
   shuffle_caption: bool = False
-  caption_seperator: str = ',',
+  caption_separator: str = ',',
   keep_tokens: int = 0
   color_aug: bool = False
   flip_aug: bool = False