diff --git a/libs/common/src/platform/services/fido2/fido2-utils.ts b/libs/common/src/platform/services/fido2/fido2-utils.ts
index 13c9762135..c3c3eba246 100644
--- a/libs/common/src/platform/services/fido2/fido2-utils.ts
+++ b/libs/common/src/platform/services/fido2/fido2-utils.ts
@@ -17,8 +17,10 @@ export class Fido2Utils {
     return Fido2Utils.fromB64ToArray(Fido2Utils.fromUrlB64ToB64(str));
   }
 
-  static bufferSourceToUint8Array(bufferSource: BufferSource) {
-    if (Fido2Utils.isArrayBuffer(bufferSource)) {
+  static bufferSourceToUint8Array(bufferSource: BufferSource): Uint8Array {
+    if (bufferSource instanceof Uint8Array) {
+      return bufferSource;
+    } else if (Fido2Utils.isArrayBuffer(bufferSource)) {
       return new Uint8Array(bufferSource);
     } else {
       return new Uint8Array(bufferSource.buffer);