diff --git a/content-type.c b/content-type.c
index 4af2a10..5edcf10 100644
--- a/content-type.c
+++ b/content-type.c
@@ -1,6 +1,6 @@
 /* See LICENSE file for license and copyright information */
 
-#define _BSD_SOURCE
+#define _DEFAULT_SOURCE
 #define _XOPEN_SOURCE 700
 
 #include "content-type.h"
diff --git a/zathura.c b/zathura.c
index 4501fff..966a045 100644
--- a/zathura.c
+++ b/zathura.c
@@ -1,6 +1,6 @@
 /* See LICENSE file for license and copyright information */
 
-#define _BSD_SOURCE
+#define _DEFAULT_SOURCE
 #define _XOPEN_SOURCE 700
 
 #include <errno.h>