diff --git a/stream/stream.h b/stream/stream.h
index 021296b247..cad61d3256 100644
--- a/stream/stream.h
+++ b/stream/stream.h
@@ -295,6 +295,10 @@ inline static int stream_seek(stream_t *s,off_t pos){
 
   mp_dbg(MSGT_DEMUX, MSGL_DBG3, "seek to 0x%qX\n",(long long)pos);
 
+  if (pos < 0) {
+    mp_msg(MSGT_DEMUX, MSGL_ERR, "Invalid seek to negative position!\n");
+    pos = 0;
+  }
   if(pos<s->pos){
     off_t x=pos-(s->pos-s->buf_len);
     if(x>=0){