diff --git a/caper/cromwell_backend.py b/caper/cromwell_backend.py
index 2ad223e..0fbc53d 100644
--- a/caper/cromwell_backend.py
+++ b/caper/cromwell_backend.py
@@ -393,6 +393,7 @@ def __init__(
         config['root'] = aws_out_dir
 
         self.default_runtime_attributes['queueArn'] = aws_batch_arn
+        self.default_runtime_attributes['scriptBucketName'] = aws_out_dir.replace('s3://', '')
 
 
 class CromwellBackendLocal(CromwellBackendBase):