diff --git a/types/express-serve-static-core/index.d.ts b/types/express-serve-static-core/index.d.ts
index d03194b119..45ee87d35f 100644
--- a/types/express-serve-static-core/index.d.ts
+++ b/types/express-serve-static-core/index.d.ts
@@ -197,9 +197,9 @@ interface Request extends http.IncomingMessage, Express.Request {
         *
         * @param name
         */
-    get(name: string): string | undefined;
+    get(name: string): string | string[] | undefined;
 
-    header(name: string): string | undefined;
+    header(name: string): string | string[] | undefined;
 
     /**
         * Check if the given `type(s)` is acceptable, returning