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-rw-r--r--extensions/libipt_ECN.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/extensions/libipt_ECN.c b/extensions/libipt_ECN.c
index 7c6c2939..314531e3 100644
--- a/extensions/libipt_ECN.c
+++ b/extensions/libipt_ECN.c
@@ -37,7 +37,7 @@ static void help(void)
#endif
-static struct option opts[] = {
+static const struct option opts[] = {
{ "ecn-tcp-remove", 0, 0, 'F' },
{ "ecn-tcp-cwr", 1, 0, 'G' },
{ "ecn-tcp-ece", 1, 0, 'H' },