diff --git a/test/bench_http.c b/test/bench_http.c
index d20d3bc7..80377ee6 100644
--- a/test/bench_http.c
+++ b/test/bench_http.c
@@ -101,6 +101,9 @@ main(int argc, char **argv)
 		return (1);
 #endif
 
+	setbuf(stdout, NULL);
+	setbuf(stderr, NULL);
+
 	for (i = 1; i < argc; ++i) {
 		if (*argv[i] != '-')
 			continue;