diff --git a/packages/openapi-typescript-helpers/src/index.ts b/packages/openapi-typescript-helpers/src/index.ts
index 3c8a004ce..f4487b38b 100644
--- a/packages/openapi-typescript-helpers/src/index.ts
+++ b/packages/openapi-typescript-helpers/src/index.ts
@@ -198,4 +198,4 @@ type RequiredKeysOfHelper<T> = {
   [K in keyof T]: {} extends Pick<T, K> ? never : K;
 }[keyof T];
 /** Get the required keys of an object, or `never` if no keys are required */
-export type RequiredKeysOf<T> = RequiredKeysOfHelper<T> extends undefined ? never : RequiredKeysOfHelper<T>;
+export type RequiredKeysOf<T> = RequiredKeysOfHelper<T> extends undefined ? never : RequiredKeysOfHelper<T> extends any ? never : RequiredKeysOfHelper<T>;