diff --git a/helpers/omit.ts b/helpers/omit.ts
index bd44384..52e37b2 100644
--- a/helpers/omit.ts
+++ b/helpers/omit.ts
@@ -1,10 +1,9 @@
-import type { Except } from "type-fest"
-
 // eslint-disable-next-line import/no-unused-modules
-export function omit<Subject extends object, Key extends keyof Subject>(
+export function omit<Subject extends object, Key extends PropertyKey>(
   subject: Subject,
   keys: Key[],
-): Except<Subject, Key> {
+  // hack: using a conditional type preserves union types
+): Subject extends any ? Omit<Subject, Key> : never {
   const result: any = {}
   for (const key in subject) {
     if (!keys.includes(key as unknown as Key)) {