diff --git a/parfive/downloader.py b/parfive/downloader.py
index cf7806c..770ab00 100644
--- a/parfive/downloader.py
+++ b/parfive/downloader.py
@@ -687,7 +687,7 @@ async def _http_download_worker(self, session, url, chunksize, http_range, queue
                 resp.headers,
             )
 
-            if resp.status < 200 or resp.status > 300:
+            if resp.status < 200 or resp.status >= 300:
                 raise MultiPartDownloadError(resp)
 
             while True: