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-rw-r--r--swaymsg/main.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/swaymsg/main.c b/swaymsg/main.c
index 243b5fdc..e640cadf 100644
--- a/swaymsg/main.c
+++ b/swaymsg/main.c
@@ -1,4 +1,4 @@
-#define _XOPEN_SOURCE 500
+#define _POSIX_C_SOURCE 200809L
#include <stdio.h>
#include <stdlib.h>
#include <string.h>