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-rw-r--r--swaynag/swaynag.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/swaynag/swaynag.c b/swaynag/swaynag.c
index 06185f20..74e127b6 100644
--- a/swaynag/swaynag.c
+++ b/swaynag/swaynag.c
@@ -1,4 +1,4 @@
-#define _XOPEN_SOURCE 500
+#define _POSIX_C_SOURCE 200809L
#include <stdlib.h>
#include <assert.h>
#include <sys/stat.h>