diff --git a/Make b/Make
index 8097b62835..c92deda259 100755
--- a/Make
+++ b/Make
@@ -36,7 +36,7 @@ while case $# in 0) break ;; esac
 do 
 	case "$1" in
 	-pedantic)
-		O="$O -Werror -ansi -pedantic -std=c99 -D_XOPEN_SOURCE=500 -D_BSD_SOURCE"
+		O="$O -Werror -ansi -pedantic -std=c99 -D_XOPEN_SOURCE=600 -D_BSD_SOURCE"
 		;;
 	--)
 		shift