diff --git a/README.md b/README.md
index e437ed6..64bec7f 100644
--- a/README.md
+++ b/README.md
@@ -425,6 +425,7 @@ No modules.
 | <a name="input_engine_version"></a> [engine\_version](#input\_engine\_version) | Version number of the cache engine to be used. If not set, defaults to the latest version | `string` | `null` | no |
 | <a name="input_final_snapshot_identifier"></a> [final\_snapshot\_identifier](#input\_final\_snapshot\_identifier) | (Redis only) Name of your final cluster snapshot. If omitted, no final snapshot will be made | `string` | `null` | no |
 | <a name="input_global_replication_group_id"></a> [global\_replication\_group\_id](#input\_global\_replication\_group\_id) | The ID of the global replication group to which this replication group should belong | `string` | `null` | no |
+| <a name="input_global_replication_group_id_suffix"></a> [global\_replication\_group\_id\_suffix](#input\_global\_replication\_group\_id\_suffix) | The ID suffix of the global replication group | `string` | `null` | no |
 | <a name="input_ip_discovery"></a> [ip\_discovery](#input\_ip\_discovery) | The IP version to advertise in the discovery protocol. Valid values are `ipv4` or `ipv6` | `string` | `null` | no |
 | <a name="input_kms_key_arn"></a> [kms\_key\_arn](#input\_kms\_key\_arn) | The ARN of the key that you wish to use if encrypting at rest. If not supplied, uses service managed encryption. Can be specified only if `at_rest_encryption_enabled = true` | `string` | `null` | no |
 | <a name="input_log_delivery_configuration"></a> [log\_delivery\_configuration](#input\_log\_delivery\_configuration) | (Redis OSS or Valkey) Specifies the destination and format of Redis OSS/Valkey SLOWLOG or Redis OSS/Valkey Engine Log | `any` | <pre>{<br/>  "slow-log": {<br/>    "destination_type": "cloudwatch-logs",<br/>    "log_format": "json"<br/>  }<br/>}</pre> | no |
diff --git a/main.tf b/main.tf
index cdeb42a..d02b7aa 100644
--- a/main.tf
+++ b/main.tf
@@ -144,7 +144,7 @@ resource "aws_elasticache_global_replication_group" "this" {
   cache_node_type            = var.node_type
   engine_version             = var.engine_version
 
-  global_replication_group_id_suffix   = var.replication_group_id
+  global_replication_group_id_suffix   = coalesce(var.global_replication_group_id_suffix, var.replication_group_id)
   global_replication_group_description = coalesce(var.description, "Global replication group")
   primary_replication_group_id         = aws_elasticache_replication_group.global[0].id
   parameter_group_name                 = local.parameter_group_name_result
diff --git a/variables.tf b/variables.tf
index f4049d6..d157d04 100644
--- a/variables.tf
+++ b/variables.tf
@@ -239,6 +239,12 @@ variable "global_replication_group_id" {
   default     = null
 }
 
+variable "global_replication_group_id_suffix" {
+  description = "The ID suffix of the global replication group"
+  type        = string
+  default     = null
+}
+
 variable "kms_key_arn" {
   description = "The ARN of the key that you wish to use if encrypting at rest. If not supplied, uses service managed encryption. Can be specified only if `at_rest_encryption_enabled = true`"
   type        = string