diff --git a/target_s3/sinks.py b/target_s3/sinks.py
index c9f2acc..f84ecb4 100644
--- a/target_s3/sinks.py
+++ b/target_s3/sinks.py
@@ -44,7 +44,7 @@ def max_size(self) -> int:
         Returns:
             Maximum batch size
         """
-        return self.config.get("batch_size", 10000)
+        return self.config.get("max_batch_size", 10000)
 
     def process_batch(self, context: dict) -> None:
         """Write out any prepped records and return once fully written."""
@@ -61,4 +61,4 @@ def process_batch(self, context: dict) -> None:
             isinstance(format_type_client, FormatBase) is True
         ), f"format_type_client must be of type Base; Type: {type(self.format_type_client)}."
 
-        format_type_client.run()
\ No newline at end of file
+        format_type_client.run()