diff --git a/sourced/ml/cmd/repos2bow.py b/sourced/ml/cmd/repos2bow.py
index 76d671c1..01a7d931 100644
--- a/sourced/ml/cmd/repos2bow.py
+++ b/sourced/ml/cmd/repos2bow.py
@@ -96,7 +96,7 @@ def keymap(r):
         bags_writer \
             .link(Repartitioner.maybe(
                 args.partitions, keymap=lambda x: x[Uast2BagFeatures.Columns.document])) \
-            .link(BOWWriter(document_indexer, df_model, bow, args.batch)) \
+            .link(BOWWriter(document_indexer, df_model, bow, "repos2bow", args.batch)) \
             .execute()
         bags.unpersist()
     pipeline_graph(args, log, root)
diff --git a/sourced/ml/transformers/bow_writer.py b/sourced/ml/transformers/bow_writer.py
index 4fc3ea18..2d116239 100644
--- a/sourced/ml/transformers/bow_writer.py
+++ b/sourced/ml/transformers/bow_writer.py
@@ -16,11 +16,12 @@ class BOWWriter(Transformer):
     DEFAULT_CHUNK_SIZE = 2 * 1000 * 1000 * 1000
 
     def __init__(self, document_indexer: Indexer, df: OrderedDocumentFrequencies,
-                 filename: str, chunk_size: int = DEFAULT_CHUNK_SIZE, **kwargs):
+                 filename: str, series: str, chunk_size: int = DEFAULT_CHUNK_SIZE, **kwargs):
         super().__init__(**kwargs)
         self.document_indexer = document_indexer
         self.df = df
         self.filename = filename
+	self.series = series
         self.chunk_size = chunk_size
 
     def __getstate__(self):
@@ -79,7 +80,7 @@ def __call__(self, head: RDD):
             filename = self.get_bow_file_name(self.filename, i)
             BOW() \
                 .construct(docs, tokens, matrix) \
-                .save(filename, deps=(self.df,))
+                .save(filename, series=self.series, deps=(self.df,))
             self._log.info("%d -> %s with %d documents, %d nnz (%s)",
                            i + 1, filename, len(docs), size,
                            humanize.naturalsize(os.path.getsize(filename)))