diff --git a/types/supertest/index.d.ts b/types/supertest/index.d.ts
index 6da2f54206..0716f9e1b5 100644
--- a/types/supertest/index.d.ts
+++ b/types/supertest/index.d.ts
@@ -32,7 +32,10 @@ declare namespace supertest {
       end(callback?: CallbackHandler): this;
     }
 
-    function agent(app?: any): SuperTest<Test>;
+    interface AgentOptions {
+      ca?: any;
+    }
+    function agent(app?: any, options?: AgentOptions): SuperTest<Test>;
 
     interface SuperTest<T extends superagent.SuperAgentRequest> extends superagent.SuperAgent<T> {
     }
diff --git a/types/supertest/supertest-tests.ts b/types/supertest/supertest-tests.ts
index 7241aac5c3..868aa8fdce 100644
--- a/types/supertest/supertest-tests.ts
+++ b/types/supertest/supertest-tests.ts
@@ -42,6 +42,11 @@ client
       });
   });
 
+// allow passing trusted CA as option to TestAgent
+supertest.agent(app, {
+  ca: 'test ca',
+});
+
 // functional expect
 (request
   .get('/') as supertest.Test)