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-rw-r--r--extra/innochecksum.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/extra/innochecksum.c b/extra/innochecksum.c
index bae5f3e8821..eda5cef4647 100644
--- a/extra/innochecksum.c
+++ b/extra/innochecksum.c
@@ -28,7 +28,7 @@
#define _LARGEFILE_SOURCE
#define _LARGEFILE64_SOURCE
-#define _XOPEN_SOURCE /* needed to include getopt.h on some platforms. */
+#define _XOPEN_SOURCE 500 /* needed to include getopt.h on some platforms. */
#include <stdio.h>
#include <stdlib.h>