diff --git a/library/train_util.py b/library/train_util.py
index 40bcfc6f..7a285a94 100644
--- a/library/train_util.py
+++ b/library/train_util.py
@@ -362,7 +362,7 @@ class BaseDataset(torch.utils.data.Dataset):
 
         fixed_tokens = []
         flex_tokens = [t.strip() for t in caption.strip().split(",")]
-        if subset.keep_tokens >= 0:
+        if subset.keep_tokens > 0:
           fixed_tokens = flex_tokens[:subset.keep_tokens]
           flex_tokens = flex_tokens[subset.keep_tokens:]