diff --git a/libavformat/aviobuf.c b/libavformat/aviobuf.c
index da836c6fd5..15d132de29 100644
--- a/libavformat/aviobuf.c
+++ b/libavformat/aviobuf.c
@@ -215,12 +215,10 @@ int64_t avio_seek(AVIOContext *s, int64_t offset, int whence)
     } else {
         int64_t res;
 
-#if CONFIG_MUXERS || CONFIG_NETWORK
         if (s->write_flag) {
             flush_buffer(s);
             s->must_flush = 1;
         }
-#endif /* CONFIG_MUXERS || CONFIG_NETWORK */
         if (!s->seek)
             return AVERROR(EPIPE);
         if ((res = s->seek(s->opaque, offset, SEEK_SET)) < 0)