diff --git a/camlibs/sonix/library.c b/camlibs/sonix/library.c
index f12057a921..f3b5fd6ec5 100644
--- a/camlibs/sonix/library.c
+++ b/camlibs/sonix/library.c
@@ -18,7 +18,7 @@
  * Boston, MA  02110-1301  USA
  */
 
-#define _BSD_SOURCE
+#define _DEFAULT_SOURCE
 
 #include <config.h>