diff --git a/packages/aws-appsync-auth-link/src/signer/signer.ts b/packages/aws-appsync-auth-link/src/signer/signer.ts
index d628dc03..5e46b222 100644
--- a/packages/aws-appsync-auth-link/src/signer/signer.ts
+++ b/packages/aws-appsync-auth-link/src/signer/signer.ts
@@ -5,7 +5,7 @@ Licensed under the Apache License, Version 2.0 (the "License"). You may not use
 or in the "license" file accompanying this file. This file is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and limitations under the License.
 */
-global.Buffer = global.Buffer || require('buffer').Buffer; // Required for aws sigv4 signing
+globalThis.Buffer = globalThis.Buffer || require('buffer').Buffer; // Required for aws sigv4 signing
 
 var url = require('url');