diff --git a/zathura/content-type.c b/zathura/content-type.c
index 3440973..825cd79 100644
--- a/zathura/content-type.c
+++ b/zathura/content-type.c
@@ -1,8 +1,5 @@
 /* See LICENSE file for license and copyright information */
 
-#define _DEFAULT_SOURCE
-#define _XOPEN_SOURCE 700
-
 #include "content-type.h"
 #include "macros.h"
 
diff --git a/zathura/zathura.c b/zathura/zathura.c
index c134fcb..46aeb24 100644
--- a/zathura/zathura.c
+++ b/zathura/zathura.c
@@ -1,8 +1,5 @@
 /* See LICENSE file for license and copyright information */
 
-#define _DEFAULT_SOURCE
-#define _XOPEN_SOURCE 700
-
 #include <errno.h>
 #include <stdlib.h>
 #include <math.h>