diff --git a/types/express-serve-static-core/index.d.ts b/types/express-serve-static-core/index.d.ts
index 45ee87d35f..cb7de5faea 100644
--- a/types/express-serve-static-core/index.d.ts
+++ b/types/express-serve-static-core/index.d.ts
@@ -197,9 +197,11 @@ interface Request extends http.IncomingMessage, Express.Request {
         *
         * @param name
         */
-    get(name: string): string | string[] | undefined;
+    get(name: "set-cookie"): string[] | undefined;
+    get(name: string): string | undefined;
 
-    header(name: string): string | string[] | undefined;
+    header(name: "set-cookie"): string[] | undefined;
+    header(name: string): string | undefined;
 
     /**
         * Check if the given `type(s)` is acceptable, returning
diff --git a/types/express/express-tests.ts b/types/express/express-tests.ts
index 2891a37d96..62e9fc7124 100644
--- a/types/express/express-tests.ts
+++ b/types/express/express-tests.ts
@@ -70,14 +70,26 @@ namespace express_tests {
         language = req.acceptsLanguages(['en', 'ja']);
         language = req.acceptsLanguages('en', 'ja');
 
-        let existingHeader1 = req.get('existingHeader') as string;
-        let nonExistingHeader1 = req.get('nonExistingHeader') as undefined;
+        // downcasting
+        req.get('set-cookie') as undefined;
+        req.get('set-cookie') as string[];
+        const setCookieHeader1 = req.get('set-cookie');
+        if (setCookieHeader1 !== undefined) {
+            const setCookieHeader2: string[] = setCookieHeader1;
+        }
+        req.get('header') as undefined;
+        req.get('header') as string;
+        const header1 = req.get('header');
+        if (header1 !== undefined) {
+            const header2: string = header1;
+        }
 
-        let existingHeader2 = req.header('existingHeader') as string;
-        let nonExistingHeader2 = req.header('nonExistingHeader') as undefined;
+        // upcasting
+        const setCookieHeader3: string[] | undefined = req.get('set-cookie');
+        const header3: string | undefined = req.header('header');
 
-        let existingHeader3 = req.headers.existingHeader as string;
-        let nonExistingHeader3 = req.headers.nonExistingHeader as any as undefined;
+        req.headers.existingHeader as string;
+        req.headers.nonExistingHeader as any as undefined;
 
         res.send(req.query['token']);
     });