diff --git a/common/log.c b/common/log.c
index 59cb9b710..9e79c4e66 100644
--- a/common/log.c
+++ b/common/log.c
@@ -1,4 +1,4 @@
-#define _POSIX_C_SOURCE 199506L
+#define _POSIX_C_SOURCE 200112L
 #include <signal.h>
 #include <stdarg.h>
 #include <stdio.h>