diff --git a/test/aap2sendfile/main.c b/test/aap2sendfile/main.c
index cf4884b..b171b16 100644
--- a/test/aap2sendfile/main.c
+++ b/test/aap2sendfile/main.c
@@ -1,7 +1,8 @@
 // SPDX-License-Identifier: BSD-3-Clause OR Apache-2.0
+#define _POSIX_C_SOURCE 200809L
+
 #include "aap2/aap2_client.h"
 
-#define _POSIX_C_SOURCE 200809L
 #include <fcntl.h>
 #include <stdio.h>
 #include <stdlib.h>