diff --git a/deployment/terraform/lambda/modelling_e2e/main.tf b/deployment/terraform/lambda/modelling_e2e/main.tf
index 31f90e1f..e7b4e127 100644
--- a/deployment/terraform/lambda/modelling_e2e/main.tf
+++ b/deployment/terraform/lambda/modelling_e2e/main.tf
@@ -25,7 +25,8 @@ module "lambda" {
 
   reserved_concurrent_executions = var.reserved_concurrent_executions
 
-  batch_size = var.batch_size
+  batch_size          = var.batch_size
+  maximum_concurrency = var.maximum_concurrency
 
   timeout     = 60
   memory_size = 1024
diff --git a/deployment/terraform/lambda/modelling_e2e/variables.tf b/deployment/terraform/lambda/modelling_e2e/variables.tf
index e45ec68a..417f2780 100644
--- a/deployment/terraform/lambda/modelling_e2e/variables.tf
+++ b/deployment/terraform/lambda/modelling_e2e/variables.tf
@@ -19,9 +19,15 @@ variable "image_digest" {
 }
 
 variable "reserved_concurrent_executions" {
+  type        = number
+  default     = -1
+  description = "Reserved concurrency for the Lambda. -1 = unreserved."
+}
+
+variable "maximum_concurrency" {
   type        = number
   default     = 2
-  description = "Concurrent executions"
+  description = "Maximum concurrent Lambda invocations from the SQS trigger."
 }
 
 variable "batch_size" {