diff --git a/packages/@aws-cdk/aws-custom-resource-sdk-adapter/lib/api-call.ts b/packages/@aws-cdk/aws-custom-resource-sdk-adapter/lib/api-call.ts
index 1e96b5063b7bc..206963362a7dd 100644
--- a/packages/@aws-cdk/aws-custom-resource-sdk-adapter/lib/api-call.ts
+++ b/packages/@aws-cdk/aws-custom-resource-sdk-adapter/lib/api-call.ts
@@ -188,7 +188,7 @@ export async function coerceSdkv3Response(value: unknown): Promise<unknown> {
     return value.toString('utf8');
   }
   if (ArrayBuffer.isView(value)) {
-    return decoder.decode(value.buffer);
+    return decoder.decode(value);
   }
 
   if (Array.isArray(value)) {
diff --git a/packages/@aws-cdk/aws-custom-resource-sdk-adapter/test/api-call.test.ts b/packages/@aws-cdk/aws-custom-resource-sdk-adapter/test/api-call.test.ts
index 8d5d11d1d21b0..ea3b62b9fe696 100644
--- a/packages/@aws-cdk/aws-custom-resource-sdk-adapter/test/api-call.test.ts
+++ b/packages/@aws-cdk/aws-custom-resource-sdk-adapter/test/api-call.test.ts
@@ -103,6 +103,7 @@ test.each([
   { transformToString: () => 'foo' },
   Buffer.from('foo'),
   new TextEncoder().encode('foo'),
+  new Uint8Array(new TextEncoder().encode('this is foo string').buffer, 8, 3),
 ])('coerce %p', async (fooValue) => {
   expect(await coerceSdkv3Response({
     foo: fooValue,