diff --git a/README.md b/README.md
index 9c1e8a49..20dc5ae6 100644
--- a/README.md
+++ b/README.md
@@ -27,7 +27,6 @@ module "memorystore" {
 |------|-------------|:----:|:-----:|:-----:|
 | alternative\_location\_id | The alternative zone where the instance will be provisioned. | string | `"null"` | no |
 | auth\_enabled | Indicates whether OSS Redis AUTH is enabled for the instance. If set to true AUTH is enabled on the instance. | bool | `"false"` | no |
-| auth\_string | AUTH String set on the instance. This field will only be populated if auth_enabled is true | string | `"null"` | no |
 | authorized\_network | The full name of the Google Compute Engine network to which the instance is connected. If left unspecified, the default network will be used. | string | `"null"` | no |
 | connect\_mode | The connection mode of the Redis instance. Can be either DIRECT_PEERING or PRIVATE_SERVICE_ACCESS. The default connect mode if not provided is DIRECT_PEERING. | string | `"null"` | no |
 | display\_name | An arbitrary and optional user-provided name for the instance. | string | `"null"` | no |
diff --git a/main.tf b/main.tf
index 46b0f091..1bf3678f 100644
--- a/main.tf
+++ b/main.tf
@@ -37,7 +37,6 @@ resource "google_redis_instance" "default" {
   labels = var.labels
 
   auth_enabled = var.auth_enabled
-  auth_string  = var.auth_string
 }
 
 module "enable_apis" {
diff --git a/variables.tf b/variables.tf
index 0c60322f..b8e6132d 100644
--- a/variables.tf
+++ b/variables.tf
@@ -107,9 +107,3 @@ variable "auth_enabled" {
   type        = bool
   default     = false
 }
-
-variable "auth_string" {
-  description = "AUTH String set on the instance. This field will only be populated if auth_enabled is true"
-  type        = string
-  default     = null
-}