diff --git a/openpgp.d.ts b/openpgp.d.ts
index 81cf5060..bfa90700 100644
--- a/openpgp.d.ts
+++ b/openpgp.d.ts
@@ -146,8 +146,8 @@ export class CleartextMessage {
 export function readMessage<T extends MaybeStream<string>>(options: { armoredMessage: T, config?: PartialConfig }): Promise<Message<T>>;
 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: { binary: T, filename?: string, date?: Date, type?: DataPacketType }): Message<T>;
+export function createMessage<T extends MaybeStream<string>>(options: { text: T, filename?: string, date?: Date, type?: DataPacketType }): Promise<Message<T>>;
+export function createMessage<T extends MaybeStream<Uint8Array>>(options: { binary: T, filename?: string, date?: Date, type?: DataPacketType }): Promise<Message<T>>;
 
 export function encrypt<T extends MaybeStream<Data>>(options: EncryptOptions & { message: Message<T>, armor: false }): Promise<
   T extends WebStream<infer X> ? WebStream<Uint8Array> :