diff --git a/libavdevice/bktr.c b/libavdevice/bktr.c
index 7b37f11159..ea9a6e25e1 100644
--- a/libavdevice/bktr.c
+++ b/libavdevice/bktr.c
@@ -24,6 +24,7 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#define _BSD_SOURCE 1
 #include "libavformat/avformat.h"
 #if defined (HAVE_DEV_BKTR_IOCTL_METEOR_H) && defined (HAVE_DEV_BKTR_IOCTL_BT848_H)
 # include <dev/bktr/ioctl_meteor.h>