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-rw-r--r--sway/config/output.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/sway/config/output.c b/sway/config/output.c
index 07543e3c..75309289 100644
--- a/sway/config/output.c
+++ b/sway/config/output.c
@@ -1,4 +1,4 @@
-#define _XOPEN_SOURCE 700
+#define _POSIX_C_SOURCE 200809L
#include <assert.h>
#include <stdbool.h>
#include <string.h>