diff --git a/demo/terraform/terraform.tfvars b/demo/terraform/terraform.tfvars
index 3c7a61cf6781aa296e58ada44a45b5512296e64d..d62bebc54be29c7cd89ef68b8ab70e4b1d7ca368 100644
--- a/demo/terraform/terraform.tfvars
+++ b/demo/terraform/terraform.tfvars
@@ -19,5 +19,8 @@ docker_volumes_size = 384
 # NFS volume
 nfs_volume_size = 256
 
+# scratch volume
+scratch_volumes_size = 128
+
 # squid volume
 squid_volume_size = 128
diff --git a/demo/terraform/vars.tf b/demo/terraform/vars.tf
index 83658c0201b0ab455c49428516f82b8c62dd488e..559190cd85c5f95973209ac373e784090c0a62e1 100644
--- a/demo/terraform/vars.tf
+++ b/demo/terraform/vars.tf
@@ -53,7 +53,7 @@ variable "nfs_volume_size" {
   description = "Size of volume for NFS server (GB)"
 }
 
-variable "scratch_volume_size" {
+variable "scratch_volumes_size" {
   type        = number
   description = "Size of volume for ephemeral volumes (GB)"
 }