1 files changed, 1 insertions, 0 deletions

diff --git a/xC.c b/xC.c
index 20845a1..ea033e0 100644
--- a/xC.c
+++ b/xC.c
@@ -49,6 +49,7 @@ enum
 #define PROGRAM_NAME "xC"
 
 // fmemopen
+#define _POSIX_C_SOURCE 200809L
 #define _XOPEN_SOURCE 700
 
 #include "common.c"