diff --git a/lib/init.c b/lib/init.c
index 33bee0f2..1e053444 100644
--- a/lib/init.c
+++ b/lib/init.c
@@ -20,7 +20,8 @@
 */
 
 /* Needed for scandir() and alphasort() */
-#define _BSD_SOURCE
+#define _BSD_SOURCE 1 /* for glibc < 2.19 */
+#define _DEFAULT_SOURCE 1 /* for glibc >= 2.19 */
 
 #include <sys/types.h>
 #include <sys/stat.h>