diff --git a/.github/workflows/test-type-definitions.yml b/.github/workflows/test-type-definitions.yml
new file mode 100644
index 00000000..594e89d9
--- /dev/null
+++ b/.github/workflows/test-type-definitions.yml
@@ -0,0 +1,21 @@
+name: Types
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+jobs:
+  lint:
+    name: Test type definitions
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/setup-node@v1
+      with:
+        node-version: '15'
+    - run: npm ci
+    - run: npm run test-type-definitions
diff --git a/openpgp.d.ts b/openpgp.d.ts
index e6098bd2..81cf5060 100644
--- a/openpgp.d.ts
+++ b/openpgp.d.ts
@@ -147,7 +147,7 @@ export function readMessage<T extends MaybeStream<string>>(options: { armoredMes
 export function readMessage<T extends MaybeStream<Uint8Array>>(options: { binaryMessage: T, config?: PartialConfig }): Promise<Message<T>>;
 
 export function createMessage<T extends MaybeStream<string>>(options: { text: T, filename?: string, date?: Date, type?: DataPacketType }): Message<T>;
-export function createMessage<T extends MaybeStream<Uint8Array>>(options: { bytes: T, filename?: string, date?: Date, type?: DataPacketType }): Message<T>;
+export function createMessage<T extends MaybeStream<Uint8Array>>(options: { binary: T, filename?: string, date?: Date, type?: DataPacketType }): Message<T>;
 
 export function encrypt<T extends MaybeStream<Data>>(options: EncryptOptions & { message: Message<T>, armor: false }): Promise<
   T extends WebStream<infer X> ? WebStream<Uint8Array> :
diff --git a/test/typescript/definitions.ts b/test/typescript/definitions.ts
index 3c60d67b..60db7c60 100644
--- a/test/typescript/definitions.ts
+++ b/test/typescript/definitions.ts
@@ -6,7 +6,7 @@
  *  - if it fails to run, edit this file to match the actual library API, then edit the definitions file (openpgp.d.ts) accordingly.
  */
 
-import { generateKey, readKey, readKeys, Key, readMessage, createMessage, createCleartextMessage, encrypt, decrypt, sign, verify, config } from '../..';
+import { generateKey, readKey, readKeys, Key, readMessage, createMessage, Message, createCleartextMessage, encrypt, decrypt, sign, verify, config } from '../..';
 
 import { expect } from 'chai';