diff --git a/libavdevice/bktr.c b/libavdevice/bktr.c
index 3e705a0247..ab70a1b2b7 100644
--- a/libavdevice/bktr.c
+++ b/libavdevice/bktr.c
@@ -26,6 +26,7 @@
 
 #define _BSD_SOURCE 1
 #define _NETBSD_SOURCE
+#define _XOPEN_SOURCE 600
 
 #include "libavformat/avformat.h"
 #if HAVE_DEV_BKTR_IOCTL_METEOR_H && HAVE_DEV_BKTR_IOCTL_BT848_H