diff --git a/types/pbf/index.d.ts b/types/pbf/index.d.ts
index fdcb9b53ce..692ca491bf 100644
--- a/types/pbf/index.d.ts
+++ b/types/pbf/index.d.ts
@@ -9,7 +9,7 @@ declare class Pbf {
     type: number;
     length: number;
 
-    constructor(buffer?: Uint8Array);
+    constructor(buffer?: Uint8Array|ArrayBuffer);
 
     destroy(): void;
     readFields<T>(readField: (tag: number, result?: T, pbf?: Pbf) => void, result?: T, end?: number): T;
diff --git a/types/pbf/pbf-tests.ts b/types/pbf/pbf-tests.ts
index c0a8556c42..f6914f5e13 100644
--- a/types/pbf/pbf-tests.ts
+++ b/types/pbf/pbf-tests.ts
@@ -2,6 +2,7 @@ import Pbf = require('pbf');
 
 const pbf = new Pbf(new Uint8Array(1));
 new Pbf();
+new Pbf(new ArrayBuffer(8));
 pbf.buf;
 pbf.pos;
 pbf.type;