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-rw-r--r--xC.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/xC.c b/xC.c
index b4b4784..20845a1 100644
--- a/xC.c
+++ b/xC.c
@@ -49,7 +49,7 @@ enum
#define PROGRAM_NAME "xC"
// fmemopen
-#define _POSIX_C_SOURCE 200809L
+#define _XOPEN_SOURCE 700
#include "common.c"
#include "xD-replies.c"