diff --git a/ci/create_nightly_json.py b/ci/create_nightly_json.py
index 2fefadd00..2ad086a82 100644
--- a/ci/create_nightly_json.py
+++ b/ci/create_nightly_json.py
@@ -18,7 +18,7 @@ def main():
             name = remove_prefix(data['fileName'], "nightly/")
             url = f"https://f001.backblazeb2.com/file/{bucket}/nightly/{urllib.parse.quote_plus(name)}"
             sha1 = data['contentSha1']
-            size = int(data['contentLength'])
+            size = int(data['size'])
             ts = int(data['fileInfo']['src_last_modified_millis'])
             date = datetime.datetime.fromtimestamp(ts/1000).strftime('%Y-%m-%d')