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-rw-r--r--builtin/checkout-index.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/builtin/checkout-index.c b/builtin/checkout-index.c
index 88b86c8d9f..eb74774cbc 100644
--- a/builtin/checkout-index.c
+++ b/builtin/checkout-index.c
@@ -132,6 +132,8 @@ static const char * const builtin_checkout_index_usage[] = {
static int option_parse_stage(const struct option *opt,
const char *arg, int unset)
{
+ BUG_ON_OPT_NEG(unset);
+
if (!strcmp(arg, "all")) {
to_tempfile = 1;
checkout_stage = CHECKOUT_ALL;