diff --git a/youtube_dl/downloader/hls.py b/youtube_dl/downloader/hls.py
index 7955ca510..1a6e226c8 100644
--- a/youtube_dl/downloader/hls.py
+++ b/youtube_dl/downloader/hls.py
@@ -88,6 +88,7 @@ class HlsFD(FragmentFD):
             if line.startswith('#'):
                 if anvato_ad(line):
                     ad_frags += 1
+                    ad_frag_next = True
                 continue
             if ad_frag_next:
                 ad_frag_next = False