diff --git a/gnes/preprocessor/text/split.py b/gnes/preprocessor/text/split.py
index 5aa2b7a6..5e89838e 100644
--- a/gnes/preprocessor/text/split.py
+++ b/gnes/preprocessor/text/split.py
@@ -53,6 +53,6 @@ def apply(self, doc: 'gnes_pb2.Document') -> None:
                 c = doc.chunks.add()
                 c.doc_id = doc.doc_id
                 c.text = f[:self.max_sent_len]
-                c.offset_1d = ci
+                c.offset = ci
                 c.weight = len(c.text) / len(doc.raw_text)
                 c.offset_nd.extend([s, e])