diff --git a/wlgol.c b/wlgol.c
index a012eb9..f034d2a 100644
--- a/wlgol.c
+++ b/wlgol.c
@@ -3,7 +3,6 @@
 #include <stdio.h>
 #include <string.h>
 
-#define _POSIX_C_SOURCE 200809L
 #include <time.h>
 
 #include <sys/mman.h>