diff --git a/.octopus/deployment_process.ocl b/.octopus/deployment_process.ocl
index 1b09c0a..7c798a3 100644
--- a/.octopus/deployment_process.ocl
+++ b/.octopus/deployment_process.ocl
@@ -73,11 +73,12 @@ step "terraform-apply" {
             Octopus.Action.Package.PackageId = "#{TF_PACKAGE}"
             Octopus.Action.RunOnServer = "true"
             Octopus.Action.Script.ScriptSource = "Package"
+            Octopus.Action.Terraform.AdditionalActionParams = "-var-file=./variables.tfvars"
             Octopus.Action.Terraform.AdditionalInitParams = "#{TF_INIT}"
             Octopus.Action.Terraform.AllowPluginDownloads = "True"
             Octopus.Action.Terraform.AzureAccount = "False"
             Octopus.Action.Terraform.EnvVariables = "{}"
-            Octopus.Action.Terraform.FileSubstitution = "*.tfvars"
+            Octopus.Action.Terraform.FileSubstitution = "variables.tfvars"
             Octopus.Action.Terraform.GoogleCloudAccount = "False"
             Octopus.Action.Terraform.ManagedAccount = "None"
             Octopus.Action.Terraform.PlanJsonOutput = "False"