diff --git a/terraform/api_gateway.tf.json.template.py b/terraform/api_gateway.tf.json.template.py
index 3e515489e7..fd8a198b8a 100644
--- a/terraform/api_gateway.tf.json.template.py
+++ b/terraform/api_gateway.tf.json.template.py
@@ -102,7 +102,6 @@ def for_domain(cls, domain):
     'domainName': '$context.domainName',
     'domainPrefix': '$context.domainPrefix',
     'error_message': '$context.error.message',
-    'error_messageString': '$context.error.messageString',
     'error_responseType': '$context.error.responseType',
     'extendedRequestId': '$context.extendedRequestId',
     'httpMethod': '$context.httpMethod',