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-rw-r--r--ssl/ssltest.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/ssl/ssltest.c b/ssl/ssltest.c
index f8e86c3ceb..e47af50a4b 100644
--- a/ssl/ssltest.c
+++ b/ssl/ssltest.c
@@ -128,7 +128,7 @@
#define USE_SOCKETS
#include "e_os.h"
-#define _XOPEN_SOURCE 1 /* Or isascii won't be declared properly on
+#define _XOPEN_SOURCE 500 /* Or isascii won't be declared properly on
VMS (at least with DECompHP C). */
#include <ctype.h>