diff --git a/src/utils/typedArrays.ts b/src/utils/typedArrays.ts
index 25619be..2c00e25 100644
--- a/src/utils/typedArrays.ts
+++ b/src/utils/typedArrays.ts
@@ -1,9 +1,17 @@
-export function ensureUint8Array(buffer: ArrayLike<number> | Uint8Array<ArrayBufferLike> | ArrayBufferView | ArrayBufferLike): Uint8Array<ArrayBufferLike> {
+function isArrayBuffer(buffer: unknown): buffer is ArrayBuffer | SharedArrayBuffer {
+  return (
+    buffer instanceof ArrayBuffer || (typeof SharedArrayBuffer !== "undefined" && buffer instanceof SharedArrayBuffer)
+  );
+}
+
+export function ensureUint8Array(
+  buffer: ArrayLike<number> | Uint8Array<ArrayBufferLike> | ArrayBufferView | ArrayBufferLike,
+): Uint8Array<ArrayBufferLike> {
   if (buffer instanceof Uint8Array) {
     return buffer;
   } else if (ArrayBuffer.isView(buffer)) {
     return new Uint8Array(buffer.buffer, buffer.byteOffset, buffer.byteLength);
-  } else if (buffer instanceof ArrayBuffer || buffer instanceof SharedArrayBuffer) {
+  } else if (isArrayBuffer(buffer)) {
     return new Uint8Array(buffer);
   } else {
     // ArrayLike<number>