diff --git a/main.tf b/main.tf
index c12e260..2e84b0a 100644
--- a/main.tf
+++ b/main.tf
@@ -21,13 +21,13 @@ terraform {
 module "services" {
   source = "./modules/services"
 
-  authentik_url = "${var.authentik_url}"
-  authentik_token = "${var.authentik_token}"
+  authentik_url = var.authentik_url
+  authentik_token = var.authentik_token
 
-  postgresql_host = "${var.postgresql_host}"
-  postgresql_port = "${var.postgresql_port}"
-  postgresql_username = "${var.postgresql_username}"
-  postgresql_password = "${var.postgresql_password}"
+  postgresql_host = var.postgresql_host
+  postgresql_port = var.postgresql_port
+  postgresql_username = var.postgresql_username
+  postgresql_password = var.postgresql_password
 
   services = var.services
 }
@@ -35,21 +35,21 @@ module "services" {
 module "infrastructure" {
   source = "./modules/infrastructure"
 
-  hcloud_token = "${var.hcloud_token}"
+  hcloud_token = var.hcloud_token
 
-  ovh_application_key = "${var.ovh_application_key}"
-  ovh_application_secret = "${var.ovh_application_secret}"
-  ovh_consumer_key = "${var.ovh_consumer_key}"
+  ovh_application_key = var.ovh_application_key
+  ovh_application_secret = var.ovh_application_secret
+  ovh_consumer_key = var.ovh_consumer_key
 
-  scaleway_access_key = "${var.scaleway_access_key}"
-  scaleway_secret_key = "${var.scaleway_secret_key}"
-  scaleway_project_id = "${var.scaleway_project_id}"
-  scaleway_organization_id = "${var.scaleway_organization_id}"
+  scaleway_access_key = var.scaleway_access_key
+  scaleway_secret_key = var.scaleway_secret_key
+  scaleway_project_id = var.scaleway_project_id
+  scaleway_organization_id = var.scaleway_organization_id
 
-  tailscale_api_key = "${var.tailscale_api_key}"
-  tailscale_tailnet = "${var.tailscale_tailnet}"
+  tailscale_api_key = var.tailscale_api_key
+  tailscale_tailnet = var.tailscale_tailnet
 
-  default_ssh_key = "${var.default_ssh_key}"
+  default_ssh_key = var.default_ssh_key
 
   hosts = var.hosts
   services = var.services
diff --git a/modules/infrastructure/hcloud.tf b/modules/infrastructure/hcloud.tf
index d3aa736..e64c0f3 100644
--- a/modules/infrastructure/hcloud.tf
+++ b/modules/infrastructure/hcloud.tf
@@ -4,10 +4,10 @@ resource "hcloud_ssh_key" "default" {
 }
 
 data "template_file" "cloud_init" {
-  template = "${file("./tf-templates/cloud-init.yaml.tpl")}"
+  template = file("./tf-templates/cloud-init.yaml.tpl")
 
   vars = {
-    tailscale_authkey = "${tailscale_tailnet_key.cloud_init_key.key}"
+    tailscale_authkey = tailscale_tailnet_key.cloud_init_key.key
     default_ssh_key   = var.default_ssh_key.public_key
   }
 }
@@ -42,7 +42,7 @@ resource "hcloud_server" "nodes" {
   image       = each.value.image
   server_type = each.value.server_type
   ssh_keys    = [hcloud_ssh_key.default.id]
-  user_data   = "${data.template_file.cloud_init.rendered}"
+  user_data   = data.template_file.cloud_init.rendered
   public_net {
     ipv4 = hcloud_primary_ip.node_ipv4_addresses[each.key].id
     ipv6 = hcloud_primary_ip.node_ipv6_addresses[each.key].id
diff --git a/modules/infrastructure/main.tf b/modules/infrastructure/main.tf
index d3d2c41..a63eab8 100644
--- a/modules/infrastructure/main.tf
+++ b/modules/infrastructure/main.tf
@@ -21,28 +21,28 @@ terraform {
 
 
 provider "hcloud" {
-  token = "${var.hcloud_token}"
+  token = var.hcloud_token
 }
 
 provider "ovh" {
   endpoint = "ovh-eu"
-  application_key = "${var.ovh_application_key}"
-  application_secret = "${var.ovh_application_secret}"
-  consumer_key = "${var.ovh_consumer_key}"
+  application_key = var.ovh_application_key
+  application_secret = var.ovh_application_secret
+  consumer_key = var.ovh_consumer_key
 }
 
 provider "scaleway" {
-  organization_id = "${var.scaleway_organization_id}"
-  project_id = "${var.scaleway_project_id}"
-  access_key = "${var.scaleway_access_key}"
-  secret_key = "${var.scaleway_secret_key}"
+  organization_id = var.scaleway_organization_id
+  project_id = var.scaleway_project_id
+  access_key = var.scaleway_access_key
+  secret_key = var.scaleway_secret_key
   region = "nl-ams"
   zone = "nl-ams-1"
 }
 
 provider "tailscale" {
-  api_key = "${var.tailscale_api_key}"
-  tailnet = "${var.tailscale_tailnet}"
+  api_key = var.tailscale_api_key
+  tailnet = var.tailscale_tailnet
 }
 
 
diff --git a/modules/infrastructure/scaleway.tf b/modules/infrastructure/scaleway.tf
index 5d70bc6..d863c9d 100644
--- a/modules/infrastructure/scaleway.tf
+++ b/modules/infrastructure/scaleway.tf
@@ -1,5 +1,5 @@
 data "scaleway_account_project" "project" {
-  project_id = "${var.scaleway_project_id}"
+  project_id = var.scaleway_project_id
 }
 
 resource "scaleway_account_ssh_key" "default" {
diff --git a/modules/services/main.tf b/modules/services/main.tf
index 03a055f..3185365 100644
--- a/modules/services/main.tf
+++ b/modules/services/main.tf
@@ -12,16 +12,16 @@ terraform {
 }
 
 provider "authentik" {
-  url   = "${var.authentik_url}"
-  token = "${var.authentik_token}"
+  url   = var.authentik_url
+  token = var.authentik_token
 }
 
 provider "postgresql" {
-  host            = "${var.postgresql_host}"
-  port            = "${var.postgresql_port}"
+  host            = var.postgresql_host
+  port            = var.postgresql_port
   database        = "postgres"
-  username        = "${var.postgresql_username}"
-  password        = "${var.postgresql_password}"
+  username        = var.postgresql_username
+  password        = var.postgresql_password
   sslmode         = "verify-full"
   connect_timeout = 15
 }