diff --git a/node/node.d.ts b/node/node.d.ts
index 80391590b7..7d6c1cd577 100644
--- a/node/node.d.ts
+++ b/node/node.d.ts
@@ -502,7 +502,7 @@ declare module "http" {
         statusCode: number;
         statusMessage: string;
         headersSent: boolean;
-        setHeader(name: string, value: string): void;
+        setHeader(name: string, value: string | string[]): void;
         sendDate: boolean;
         getHeader(name: string): string;
         removeHeader(name: string): void;