diff --git a/src/blob.ts b/src/blob.ts
index 3224896..58e56ed 100644
--- a/src/blob.ts
+++ b/src/blob.ts
@@ -10,12 +10,13 @@ export class Blob {
   /**
    * @param data Binary font data.
    */
-  constructor(data: ArrayBuffer) {
-    const blobPtr = exports.malloc(data.byteLength);
-    Module.HEAPU8.set(new Uint8Array(data), blobPtr);
+  constructor(data: Uint8Array | ArrayBuffer) {
+    const array = data instanceof Uint8Array ? data : new Uint8Array(data);
+    const blobPtr = exports.malloc(array.byteLength);
+    Module.HEAPU8.set(array, blobPtr);
     this.ptr = exports.hb_blob_create(
       blobPtr,
-      data.byteLength,
+      array.byteLength,
       2 /* HB_MEMORY_MODE_WRITABLE */,
       blobPtr,
       freeFuncPtr,