diff --git a/libavformat/aviobuf.c b/libavformat/aviobuf.c
index da05251279..37a6f6dee3 100644
--- a/libavformat/aviobuf.c
+++ b/libavformat/aviobuf.c
@@ -130,6 +130,8 @@ int64_t url_fseek(ByteIOContext *s, int64_t offset, int whence)
 {
     int64_t offset1;
     int64_t pos;
+    int force = whence & AVSEEK_FORCE;
+    whence &= ~AVSEEK_FORCE;
 
     if(!s)
         return AVERROR(EINVAL);
@@ -151,8 +153,7 @@ int64_t url_fseek(ByteIOContext *s, int64_t offset, int whence)
         /* can do the seek inside the buffer */
         s->buf_ptr = s->buffer + offset1;
     } else if(s->is_streamed && !s->write_flag && offset1 >= 0 &&
-              (   offset1 < (s->buf_end - s->buffer) + (1<<16)
-               || (whence & AVSEEK_FORCE))){
+              (offset1 < (s->buf_end - s->buffer) + (1<<16) || force)) {
         while(s->pos < offset && !s->eof_reached)
             fill_buffer(s);
         if (s->eof_reached)