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-rw-r--r--extensions/libxt_u32.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/extensions/libxt_u32.c b/extensions/libxt_u32.c
index 774d5eac..6d024fb6 100644
--- a/extensions/libxt_u32.c
+++ b/extensions/libxt_u32.c
@@ -24,7 +24,7 @@ enum {
static const struct xt_option_entry u32_opts[] = {
{.name = "u32", .id = O_U32, .type = XTTYPE_STRING,
- .flags = XTOPT_MAND},
+ .flags = XTOPT_MAND | XTOPT_INVERT},
XTOPT_TABLEEND,
};