diff --git a/tools/usb/ffs-test.c b/tools/usb/ffs-test.c
index 88d5e71be0449ff7afdb6bdefbea98045fefd612..64fc72acc8928e67ae5bf87ed14d0fef9d658124 100644
--- a/tools/usb/ffs-test.c
+++ b/tools/usb/ffs-test.c
@@ -22,7 +22,7 @@
 /* $(CROSS_COMPILE)cc -Wall -Wextra -g -o ffs-test ffs-test.c -lpthread */
 
 
-#define _BSD_SOURCE /* for endian.h */
+#define _DEFAULT_SOURCE /* for endian.h */
 
 #include <endian.h>
 #include <errno.h>