diff --git a/src/bin/initdb/initdb.c b/src/bin/initdb/initdb.c
index edd5d71eb8..52aedca459 100644
--- a/src/bin/initdb/initdb.c
+++ b/src/bin/initdb/initdb.c
@@ -895,7 +895,7 @@ test_config_settings(void)
 		100, 50, 40, 30, 20, 10
 	};
 	static const int trial_bufs[] = {
-		4096, 3584, 3072, 2560, 2048, 1536,
+		16384, 8192, 4096, 3584, 3072, 2560, 2048, 1536,
 		1000, 900, 800, 700, 600, 500,
 		400, 300, 200, 100, 50
 	};