diff --git a/testing/benchmark/main.tf b/testing/benchmark/main.tf
index 438df5ae2f9..713eb4725db 100644
--- a/testing/benchmark/main.tf
+++ b/testing/benchmark/main.tf
@@ -156,7 +156,7 @@ module "standalone_apm_server" {
   aws_os              = "amzn2-ami-hvm-*-x86_64-ebs"
   apm_instance_type   = var.standalone_apm_server_instance_size
   apm_volume_type     = var.standalone_apm_server_volume_type
-  apm_volume_size     = var.standalone_apm_server_volume_size
+  apm_volume_size     = var.apm_server_tail_sampling ? coalesce(var.standalone_apm_server_volume_size, 60) : var.standalone_apm_server_volume_size
   apm_server_bin_path = var.apm_server_bin_path
   ea_managed          = false