diff --git a/gst/asfdemux/gstasfdemux.c b/gst/asfdemux/gstasfdemux.c
index 4b323c1dbd..ecbec39cd0 100644
--- a/gst/asfdemux/gstasfdemux.c
+++ b/gst/asfdemux/gstasfdemux.c
@@ -592,7 +592,7 @@ gst_asf_demux_handle_seek_push (GstASFDemux * demux, GstEvent * event)
 
   GST_DEBUG_OBJECT (demux, "seeking to packet %d", packet);
 
-  cur = demux->data_offset + (packet * demux->packet_size);
+  cur = demux->data_offset + ((guint64) packet * demux->packet_size);
 
   GST_DEBUG_OBJECT (demux, "Pushing BYTE seek rate %g, "
       "start %" G_GINT64_FORMAT ", stop %" G_GINT64_FORMAT, rate, cur, stop);