diff --git a/ga4gh/refget/loader/destinations/aws/s3/aws_s3_uploader.py b/ga4gh/refget/loader/destinations/aws/s3/aws_s3_uploader.py
index 96270cb..7ec7de0 100644
--- a/ga4gh/refget/loader/destinations/aws/s3/aws_s3_uploader.py
+++ b/ga4gh/refget/loader/destinations/aws/s3/aws_s3_uploader.py
@@ -44,7 +44,7 @@ def __init__(self, manifest):
             + "--bucket {bucket_name} " \
             + "--key {s3_path} " \
             + "--acl public-read " \
-            + "--content-type {content_type}" \
+            + "--content-type {content_type} " \
             + "{aws_profile} "
         
         # template for putting a seq by its primary id