diff --git a/lib/stream.h b/lib/stream.h
index 54a1674..1f6c377 100644
--- a/lib/stream.h
+++ b/lib/stream.h
@@ -196,7 +196,7 @@
 u_char *stream_pnt (struct stream *);
 
 /* Stream fifo. */
-struct stream_fifo *stream_fifo_new ();
+struct stream_fifo *stream_fifo_new (void);
 void stream_fifo_push (struct stream_fifo *fifo, struct stream *s);
 struct stream *stream_fifo_pop (struct stream_fifo *fifo);
 struct stream *stream_fifo_head (struct stream_fifo *fifo);