diff --git a/hosts/earth/configuration.nix b/hosts/earth/configuration.nix
index 7ed0028..774cb71 100644
--- a/hosts/earth/configuration.nix
+++ b/hosts/earth/configuration.nix
@@ -29,6 +29,14 @@
 
   networking.hostName = "earth"; # Define your hostname.
 
+  virtualisation.vmVariant = {
+    # following configuration is added only when building VM with build-vm
+    virtualisation = {
+      memorySize = 2048; # Use 2048MiB memory.
+      cores = 4;
+    };
+  };
+
   # Enable networking
   networking.networkmanager.enable = true;