diff --git a/variables.pkr.hcl b/variables.pkr.hcl
index 7e045c7..248d9cf 100644
--- a/variables.pkr.hcl
+++ b/variables.pkr.hcl
@@ -109,7 +109,7 @@ variable "vagrant_boot_cmd_9_x86_64_bios" {
   description = "The boot command for x86_64 VMs in a BIOS mode"
   type        = list(string)
   default = [
-    "<up><wait><tab> inst.text inst.gpt inst.lang=en_US ",
+    "<up><wait><tab> inst.text inst.gpt inst.lang=en_US.UTF-8 ",
     "inst.ks=http://{{ .HTTPIP }}:{{ .HTTPPort }}/msvsphere-9-vagrant.x86_64.ks",
     "<enter><wait>"
   ]