diff --git a/index.d.ts b/index.d.ts
index 71332ee2d0..13f5b526ab 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -113,7 +113,7 @@ export interface AxiosDefaults<D = any> extends Omit<AxiosRequestConfig<D>, 'hea
 }
 
 export interface CreateAxiosDefaults<D = any> extends Omit<AxiosRequestConfig<D>, 'headers'> {
-  headers: Partial<HeadersDefaults>;
+  headers?: Partial<HeadersDefaults>;
 }
 
 export interface AxiosResponse<T = unknown, D = any>  {