diff --git a/t/t9001-send-email.sh b/t/t9001-send-email.sh
index 5e48318013..1dc4a9228e 100755
--- a/t/t9001-send-email.sh
+++ b/t/t9001-send-email.sh
@@ -319,7 +319,7 @@ test_expect_success $PREREQ 'In-Reply-To without --chain-reply-to' '
 	git send-email \
 		--from="Example <nobody@example.com>" \
 		--to=nobody@example.com \
-		--no-chain-reply-to \
+		--nochain-reply-to \
 		--in-reply-to="$(cat expect)" \
 		--smtp-server="$(pwd)/fake.sendmail" \
 		$patches $patches $patches \