diff --git a/tests/usbg-io-wrappers.c b/tests/usbg-io-wrappers.c
index bc89aa3..273b2f7 100644
--- a/tests/usbg-io-wrappers.c
+++ b/tests/usbg-io-wrappers.c
@@ -1,4 +1,3 @@
-#define _GNU_SOURCE
 #include <dirent.h>
 #include <stdio.h>
 #include <stdarg.h>