diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index f46eb57df..781d66cb5 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -6,6 +6,10 @@
 
 - ci: removing headless browser tests pending a rewrite
 
+### Added
+
+- test: adding test for backwards compatibility with actor for v1 agents
+
 ## [1.4.0] - 2024-06-17
 
 ### Added
diff --git a/e2e/node/canisters/counter.ts b/e2e/node/canisters/counter.ts
index 73076cc1d..0818e5303 100644
--- a/e2e/node/canisters/counter.ts
+++ b/e2e/node/canisters/counter.ts
@@ -1,4 +1,4 @@
-import { Actor, ActorSubclass, HttpAgentOptions } from '@dfinity/agent';
+import { Actor, ActorSubclass, HttpAgentOptions, Agent } from '@dfinity/agent';
 import { IDL } from '@dfinity/candid';
 import { Principal } from '@dfinity/principal';
 import { readFileSync } from 'fs';
@@ -47,20 +47,22 @@ export default async function (): Promise<{
   return cache;
 }
 
-export const createActor = async (options?: HttpAgentOptions) => {
+export const createActor = async (options?: HttpAgentOptions, agent?: Agent) => {
   const module = readFileSync(path.join(__dirname, 'counter.wasm'));
-  const agent = await makeAgent({
-    ...options,
-  });
+  const effectiveAgent = agent
+    ? agent
+    : await makeAgent({
+        ...options,
+      });
   try {
     if (!options?.host?.includes('icp-api')) {
-      await agent.fetchRootKey();
+      await effectiveAgent.fetchRootKey();
     }
   } catch (_) {
     //
   }
 
-  const canisterId = await Actor.createCanister({ agent });
-  await Actor.install({ module }, { canisterId, agent });
-  return Actor.createActor(idl, { canisterId, agent }) as ActorSubclass<_SERVICE>;
+  const canisterId = await Actor.createCanister({ agent: effectiveAgent });
+  await Actor.install({ module }, { canisterId, agent: effectiveAgent });
+  return Actor.createActor(idl, { canisterId, agent: effectiveAgent }) as ActorSubclass<_SERVICE>;
 };
diff --git a/e2e/node/integration/actor.test.ts b/e2e/node/integration/actor.test.ts
new file mode 100644
index 000000000..49b48cf4c
--- /dev/null
+++ b/e2e/node/integration/actor.test.ts
@@ -0,0 +1,22 @@
+import { HttpAgent } from '@dfinity/agent';
+import { HttpAgent as HttpAgentv1 } from 'agent1';
+import { createActor } from '../canisters/counter';
+import { vi, test, expect } from 'vitest';
+
+vi.useRealTimers();
+test("Legacy Agent interface should be accepted by Actor's createActor", async () => {
+  // Use the v1.4.0 agent to create an actor
+  const actor = await createActor(
+    {},
+    new HttpAgentv1({
+      host: `http://127.0.0.1:${process.env.REPLICA_PORT ?? 4943}`,
+    }) as unknown as HttpAgent,
+  );
+
+  // Verify that update calls work
+  await actor.write(8n); //?
+  // Verify that query calls work
+  const count = await actor.read(); //?
+  expect(count).toBe(8n);
+}, 15_000);
+// TODO: tests for rejected, unknown time out
diff --git a/e2e/node/package.json b/e2e/node/package.json
index 7fbee2052..755ed3076 100644
--- a/e2e/node/package.json
+++ b/e2e/node/package.json
@@ -32,6 +32,7 @@
     "@types/text-encoding": "^0.0.36",
     "@typescript-eslint/eslint-plugin": "^5.30.5",
     "@typescript-eslint/parser": "^5.30.5",
+    "agent1": "npm:@dfinity/agent@^1.4.0",
     "esbuild": "^0.15.16",
     "eslint": "^8.19.0",
     "eslint-plugin-jsdoc": "^39.3.3",
diff --git a/package-lock.json b/package-lock.json
index 4c6beb99b..c956aa8f9 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -81,6 +81,7 @@
         "@types/text-encoding": "^0.0.36",
         "@typescript-eslint/eslint-plugin": "^5.30.5",
         "@typescript-eslint/parser": "^5.30.5",
+        "agent1": "npm:@dfinity/agent@^1.4.0",
         "esbuild": "^0.15.16",
         "eslint": "^8.19.0",
         "eslint-plugin-jsdoc": "^39.3.3",
@@ -4563,6 +4564,26 @@
         "node": ">= 6.0.0"
       }
     },
+    "node_modules/agent1": {
+      "name": "@dfinity/agent",
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/@dfinity/agent/-/agent-1.4.0.tgz",
+      "integrity": "sha512-/zgGajZpxtbu+kLXtFx2e9V2+HbMUjrtGWx9ZEwtVwhVxKgVi/2kGQpFRPEDFJ461V7wdTwCig4OkMxVU4shTw==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@noble/curves": "^1.4.0",
+        "@noble/hashes": "^1.3.1",
+        "base64-arraybuffer": "^0.2.0",
+        "borc": "^2.1.1",
+        "buffer": "^6.0.3",
+        "simple-cbor": "^0.4.1"
+      },
+      "peerDependencies": {
+        "@dfinity/candid": "^1.4.0",
+        "@dfinity/principal": "^1.4.0"
+      }
+    },
     "node_modules/ajv": {
       "version": "6.12.6",
       "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",
diff --git a/packages/agent/src/actor.test.ts b/packages/agent/src/actor.test.ts
index aac774204..8f3ef481e 100644
--- a/packages/agent/src/actor.test.ts
+++ b/packages/agent/src/actor.test.ts
@@ -370,6 +370,5 @@ describe('makeActor', () => {
     );
   });
 });
-// TODO: tests for rejected, unknown time out
 
 jest.setTimeout(20000);
diff --git a/packages/agent/src/actor.ts b/packages/agent/src/actor.ts
index a5f145218..88fe7f9d1 100644
--- a/packages/agent/src/actor.ts
+++ b/packages/agent/src/actor.ts
@@ -531,6 +531,10 @@ function _createActorMethod(
         effectiveCanisterId: ecid,
       });
 
+      requestId;
+      response;
+      requestDetails;
+
       if (!response.ok || response.body /* IC-1462 */) {
         throw new UpdateCallRejectedError(cid, methodName, requestId, response);
       }
@@ -544,6 +548,7 @@ function _createActorMethod(
         pollStrategy,
         blsVerify,
       );
+      reply;
       const shouldIncludeHttpDetails = func.annotations.includes(ACTOR_METHOD_WITH_HTTP_DETAILS);
       const shouldIncludeCertificate = func.annotations.includes(ACTOR_METHOD_WITH_CERTIFICATE);