diff --git a/library/config_util.py b/library/config_util.py
index d75d03b03..97554bbef 100644
--- a/library/config_util.py
+++ b/library/config_util.py
@@ -523,6 +523,7 @@ def generate_dataset_group_by_blueprint(dataset_group_blueprint: DatasetGroupBlu
           shuffle_caption: {subset.shuffle_caption}
           keep_tokens: {subset.keep_tokens}
           keep_tokens_separator: {subset.keep_tokens_separator}
+          caption_separator: {subset.caption_separator}
           secondary_separator: {subset.secondary_separator}
           enable_wildcard: {subset.enable_wildcard}
           caption_dropout_rate: {subset.caption_dropout_rate}