diff --git a/libavformat/asf.c b/libavformat/asf.c
index 695cfeca75..0024c2c144 100644
--- a/libavformat/asf.c
+++ b/libavformat/asf.c
@@ -567,7 +567,7 @@ static int asf_get_packet(AVFormatContext *s)
     int rsize = 8;
     int c, d, e, off;
 
-    off= (url_ftell(s->pb) - s->data_offset) % asf->packet_size + 3;
+    off= (url_ftell(pb) - s->data_offset) % asf->packet_size + 3;
 
     c=d=e=-1;
     while(off-- > 0){
@@ -723,7 +723,7 @@ static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
             /* fail safe */
             url_fskip(pb, ret);
 
-            asf->packet_pos= url_ftell(s->pb);
+            asf->packet_pos= url_ftell(pb);
             if (asf->data_object_size != (uint64_t)-1 &&
                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
                 return AVERROR(EIO); /* Do not exceed the size of the data object */