diff --git a/zerver/lib/export.py b/zerver/lib/export.py
index 16eb973757..d56e3b8da5 100644
--- a/zerver/lib/export.py
+++ b/zerver/lib/export.py
@@ -1248,7 +1248,7 @@ def import_uploads_s3(bucket_name, import_dir, processing_avatars=False):
         key.set_metadata("realm_id", str(user_profile.realm.id))
         key.set_metadata("orig_last_modified", record['last_modified'])
 
-        headers = {'Content-Type': key['content_type']}
+        headers = {'Content-Type': record['content_type']}
 
         key.set_contents_from_filename(os.path.join(import_dir, record['path']), headers=headers)