diff --git a/src/auth-authorizer/lambda_function.py b/src/auth-authorizer/lambda_function.py
index c798d84..dfaea40 100644
--- a/src/auth-authorizer/lambda_function.py
+++ b/src/auth-authorizer/lambda_function.py
@@ -5,11 +5,11 @@
 from urllib.request import urlopen
 
 
-AWS_REGION = os.environ.get('REGION')
+REGION = os.environ.get('REGION')
 USER_POOL_ID = os.environ.get('USER_POOL_ID')
 APP_CLIENT_ID = os.environ.get('CLIENT_ID')
 
-KEYS_URL = f'https://cognito-idp.{AWS_REGION}.amazonaws.com/{USER_POOL_ID}/.well-known/jwks.json'
+KEYS_URL = f'https://cognito-idp.{REGION}.amazonaws.com/{USER_POOL_ID}/.well-known/jwks.json'
 KEYS = requests.get(KEYS_URL).json()['keys']
 
 def lambda_handler(event, context):
diff --git a/terraform/main.tf b/terraform/main.tf
index 23d520c..612f0f3 100644
--- a/terraform/main.tf
+++ b/terraform/main.tf
@@ -199,7 +199,7 @@ module "lambda_auth_authorizer" {
   source_path = "../src/auth-authorizer"
 
   environment_variables = {
-    AWS_REGION   = var.region
+    REGION       = var.region
     USER_POOL_ID = aws_cognito_user_pool.user_pool.id
     CLIENT_ID    = aws_cognito_user_pool_client.client.id
   }