diff --git a/terraform/variables.tf b/terraform/variables.tf
index 455a09a..9153333 100644
--- a/terraform/variables.tf
+++ b/terraform/variables.tf
@@ -44,7 +44,7 @@ variable "vm_defaults" {
     bridge         = string
     vm_cpu         = number
     vm_ram         = number
-    vm_size        = string
+    vm_size        = number
   })
   default = {
     node_datastore = "hlst"
@@ -54,7 +54,7 @@ variable "vm_defaults" {
     bridge         = "vmbr0"
     vm_cpu         = 1
     vm_ram         = 2048
-    vm_size        = "20G"
+    vm_size        = 20
   }
 }