diff --git a/scripts/upload_static_files_to_s3.py b/scripts/upload_static_files_to_s3.py
index a61da18ef..7b2cc2a9d 100755
--- a/scripts/upload_static_files_to_s3.py
+++ b/scripts/upload_static_files_to_s3.py
@@ -47,9 +47,7 @@ def upload(config_file):
     bucket = s3.get_bucket(bucket_name)
 
     # build a list of files already in the bucket
-    remote_files = {}
-    for key in bucket.list():
-        remote_files[key.name] = key.etag.strip('"')
+    remote_files = {key.name : key.etag.strip('"') for key in bucket.list()}
 
     # upload local files not already in the bucket
     for root, dirs, files in os.walk(static_root):