diff --git a/elasticsearch/helpers/__init__.py b/elasticsearch/helpers/__init__.py
index 8a349654..df4e1b77 100644
--- a/elasticsearch/helpers/__init__.py
+++ b/elasticsearch/helpers/__init__.py
@@ -55,7 +55,7 @@ def _chunk_actions(actions, chunk_size, max_chunk_bytes, serializer):
     bulk_actions, bulk_data = [], []
     size, action_count = 0, 0
     for action, data in actions:
-        raw_data, raw_action = action
+        raw_data, raw_action = data, action
         action = serializer.dumps(action)
         cur_size = len(action) + 1