diff --git a/agents.tf b/agents.tf
index c3aff0c..8ca5cc7 100644
--- a/agents.tf
+++ b/agents.tf
@@ -28,8 +28,7 @@ resource "hcloud_server" "agents" {
 
     connection {
       user        = "root"
-      private_key = var.private_key == null ? null : file(var.private_key)
-      agent_identity = var.private_key == null ? file(var.public_key) : null
+      private_key = file(var.private_key)
       host        = self.ipv4_address
     }
   }
@@ -40,8 +39,7 @@ resource "hcloud_server" "agents" {
 
     connection {
       user        = "root"
-      private_key = var.private_key == null ? null : file(var.private_key)
-      agent_identity = var.private_key == null ? file(var.public_key) : null
+      private_key = file(var.private_key)
       host        = self.ipv4_address
     }
   }
diff --git a/master.tf b/master.tf
index 7b957c8..8da0368 100644
--- a/master.tf
+++ b/master.tf
@@ -24,8 +24,7 @@ resource "hcloud_server" "first_control_plane" {
 
     connection {
       user        = "root"
-      private_key = var.private_key == null ? null : file(var.private_key)
-      agent_identity = var.private_key == null ? file(var.public_key) : null
+      private_key = file(var.private_key)
       host        = self.ipv4_address
     }
   }
@@ -36,8 +35,7 @@ resource "hcloud_server" "first_control_plane" {
 
     connection {
       user        = "root"
-      private_key = var.private_key == null ? null : file(var.private_key)
-      agent_identity = var.private_key == null ? file(var.public_key) : null
+      private_key = file(var.private_key)
       host        = self.ipv4_address
     }
   }
@@ -45,7 +43,7 @@ resource "hcloud_server" "first_control_plane" {
   # Wait for k3os to be ready and fetch kubeconfig.yaml
   provisioner "local-exec" {
     command = <<-EOT
-      sleep 60 && ping ${self.ipv4_address} | grep --line-buffered "bytes from" | head -1 && sleep 100 && scp -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -i ${var.private_key == null ? var.public_key : var.private_key} rancher@${self.ipv4_address}:/etc/rancher/k3s/k3s.yaml ${path.module}/kubeconfig.yaml
+      sleep 60 && ping ${self.ipv4_address} | grep --line-buffered "bytes from" | head -1 && sleep 100 && scp -o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null -i ${var.private_key} rancher@${self.ipv4_address}:/etc/rancher/k3s/k3s.yaml ${path.module}/kubeconfig.yaml
       sed -i -e 's/127.0.0.1/${self.ipv4_address}/g' ${path.module}/kubeconfig.yaml
     EOT
   }
diff --git a/servers.tf b/servers.tf
index 8972903..1510017 100644
--- a/servers.tf
+++ b/servers.tf
@@ -27,8 +27,7 @@ resource "hcloud_server" "control_planes" {
 
     connection {
       user        = "root"
-      private_key = var.private_key == null ? null : file(var.private_key)
-      agent_identity = var.private_key == null ? file(var.public_key) : null
+      private_key = file(var.private_key)
       host        = self.ipv4_address
     }
   }
@@ -39,8 +38,7 @@ resource "hcloud_server" "control_planes" {
 
     connection {
       user        = "root"
-      private_key = var.private_key == null ? null : file(var.private_key)
-      agent_identity = var.private_key == null ? file(var.public_key) : null
+      private_key = file(var.private_key)
       host        = self.ipv4_address
     }
   }
diff --git a/variables.tf b/variables.tf
index 49756b8..4b5c424 100644
--- a/variables.tf
+++ b/variables.tf
@@ -12,7 +12,6 @@ variable "public_key" {
 variable "private_key" {
   description = "SSH private Key."
   type        = string
-  default     = null
 }
 
 variable "location" {