diff --git a/src/signableMessage.ts b/src/signableMessage.ts
index 4aee73fa..4fe82b7e 100644
--- a/src/signableMessage.ts
+++ b/src/signableMessage.ts
@@ -57,7 +57,7 @@ export class SignableMessage {
     return this.signature;
   }
 
-  applySignature(signature: ISignature | Buffer) {
+  applySignature(signature: ISignature | Uint8Array) {
     this.signature = interpretSignatureAsBuffer(signature);
   }