diff --git a/libavformat/asfdec.c b/libavformat/asfdec.c
index 176b990cb4..74133d9a57 100644
--- a/libavformat/asfdec.c
+++ b/libavformat/asfdec.c
@@ -1362,7 +1362,7 @@ static void asf_build_simple_index(AVFormatContext *s, int stream_index)
             last_pos=pos;
             }
         }
-        asf->index_read= ict > 0;
+        asf->index_read= ict > 1;
     }
     avio_seek(s->pb, current_pos, SEEK_SET);
 }