diff --git a/index.d.cts b/index.d.cts
index 81d2296d..0a022479 100644
--- a/index.d.cts
+++ b/index.d.cts
@@ -503,7 +503,7 @@ declare namespace axios {
     httpAgent?: any;
     httpsAgent?: any;
     proxy?: AxiosProxyConfig | false;
-    cancelToken?: CancelToken;
+    cancelToken?: CancelToken | undefined;
     decompress?: boolean;
     transitional?: TransitionalOptions;
     signal?: GenericAbortSignal;