diff --git a/youtube_dl/extractor/vidlii.py b/youtube_dl/extractor/vidlii.py
index 3a47619b0..14b821570 100644
--- a/youtube_dl/extractor/vidlii.py
+++ b/youtube_dl/extractor/vidlii.py
@@ -13,6 +13,7 @@ from ..utils import (
     strip_or_none,
     unified_strdate,
     urljoin,
+    str_to_int,
 )