diff --git a/types/basic-auth/basic-auth-tests.ts b/types/basic-auth/basic-auth-tests.ts
index 22e27a5a49..e416afe352 100644
--- a/types/basic-auth/basic-auth-tests.ts
+++ b/types/basic-auth/basic-auth-tests.ts
@@ -1,6 +1,12 @@
-
+import {IncomingMessage} from 'http';
 import auth = require('basic-auth');
 
-auth(null);
+const loginData = auth(undefined! as IncomingMessage);
+if (loginData) {
+    const {name, pass} = loginData;
+}
 
-auth.parse('Basic QmFzaWM6QXV0aA==');
+const parsed = auth.parse('Basic QmFzaWM6QXV0aA==');
+if (parsed) {
+    const {name, pass} = parsed;
+}
diff --git a/types/basic-auth/index.d.ts b/types/basic-auth/index.d.ts
index 8292f1349f..276b5b8af6 100644
--- a/types/basic-auth/index.d.ts
+++ b/types/basic-auth/index.d.ts
@@ -1,4 +1,4 @@
-// Type definitions for basic-auth v1.1.0
+// Type definitions for basic-auth 1.1
 // Project: https://github.com/jshttp/basic-auth
 // Definitions by: Clément Bourgeois <https://github.com/moonpyk>, Vesa Poikajärvi <https://github.com/vesse>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
@@ -7,7 +7,8 @@
 
 import * as http from 'http';
 
-declare function auth(req: http.IncomingMessage): auth.BasicAuthResult;
+// See https://github.com/jshttp/basic-auth/blob/v1.1.0/index.js#L49
+declare function auth(req: http.IncomingMessage): auth.BasicAuthResult | undefined;
 
 declare namespace auth {
     interface BasicAuthResult {
diff --git a/types/basic-auth/tsconfig.json b/types/basic-auth/tsconfig.json
index b9f77df9d2..8d9222de2c 100644
--- a/types/basic-auth/tsconfig.json
+++ b/types/basic-auth/tsconfig.json
@@ -6,7 +6,7 @@
         ],
         "noImplicitAny": true,
         "noImplicitThis": true,
-        "strictNullChecks": false,
+        "strictNullChecks": true,
         "baseUrl": "../",
         "typeRoots": [
             "../"
diff --git a/types/basic-auth/tslint.json b/types/basic-auth/tslint.json
new file mode 100644
index 0000000000..2750cc0197
--- /dev/null
+++ b/types/basic-auth/tslint.json
@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }
\ No newline at end of file