diff --git a/builtin/worktree.c b/builtin/worktree.c
index 654d27c3e1ce99..3204afdb12a348 100644
--- a/builtin/worktree.c
+++ b/builtin/worktree.c
@@ -897,7 +897,7 @@ static int add(int ac, const char **av, const char *prefix,
 
 		/* DWIM: Infer --orphan when repo has no refs. */
 		opts.orphan = (!s) && dwim_orphan(&opts, !!opt_track, 1);
-	} else if (ac == 2) {
+	} else if (ac == 2 && !new_branch) {
 		struct object_id oid;
 		struct commit *commit;
 		char *remote;
diff --git a/t/t2400-worktree-add.sh b/t/t2400-worktree-add.sh
index 87b926728ad8cf..9cbf84861d2b7f 100755
--- a/t/t2400-worktree-add.sh
+++ b/t/t2400-worktree-add.sh
@@ -621,6 +621,16 @@ test_expect_success '"add" <path> <branch> dwims' '
 	)
 '
 
+test_expect_success '"add" <path> <branch> does not dwim with -b' '
+	test_when_finished rm -rf repo_upstream repo_dwim foo &&
+	setup_remote_repo repo_upstream repo_dwim &&
+	git init repo_dwim &&
+	(
+		cd repo_dwim &&
+		test_must_fail git worktree add -b branch ../foo foo
+	)
+'
+
 test_expect_success '"add" <path> <branch> dwims with checkout.defaultRemote' '
 	test_when_finished rm -rf repo_upstream repo_dwim foo &&
 	setup_remote_repo repo_upstream repo_dwim &&