diff --git a/libavformat/asfdec_f.c b/libavformat/asfdec_f.c
index fcc2b98a2c..2441cadb44 100644
--- a/libavformat/asfdec_f.c
+++ b/libavformat/asfdec_f.c
@@ -675,7 +675,7 @@ static int asf_read_marker(AVFormatContext *s)
 
         avio_rl64(pb);             // offset, 8 bytes
         pres_time = avio_rl64(pb); // presentation time
-        pres_time = av_sat_sub64(pres_time, asf->hdr.preroll * 10000);
+        pres_time = av_sat_sub64(pres_time, asf->hdr.preroll * 10000LL);
         avio_rl16(pb);             // entry length
         avio_rl32(pb);             // send time
         avio_rl32(pb);             // flags