diff --git a/ts_src/psbt.ts b/ts_src/psbt.ts
index f072f1d48..29cdf4c36 100644
--- a/ts_src/psbt.ts
+++ b/ts_src/psbt.ts
@@ -1760,11 +1760,11 @@ function getPrevoutTaprootKey(
   cache: PsbtCache,
 ): Uint8Array | null {
   const { script } = getScriptAndAmountFromUtxo(inputIndex, input, cache);
-  return isP2TR(script) ? script.subarray(2, 34) : null;
+  return isP2TR(script) ? script.slice(2, 34) : null;
 }
 
 function trimTaprootSig(signature: Uint8Array): Uint8Array {
-  return signature.length === 64 ? signature : signature.subarray(0, 64);
+  return signature.length === 64 ? signature : signature.slice(0, 64);
 }
 
 function getTaprootHashesForSigning(