diff --git a/stacks/ollama/main.tf b/stacks/ollama/main.tf
index 872c9b6f..6302dbe2 100644
--- a/stacks/ollama/main.tf
+++ b/stacks/ollama/main.tf
@@ -1,5 +1,5 @@
 variable "tls_secret_name" { type = string }
-variable "ollama_api_credentials" { type = string }
+variable "ollama_api_credentials" { type = map(string) }
 
 locals {
   tiers = {
diff --git a/stacks/owntracks/main.tf b/stacks/owntracks/main.tf
index 9a1b17c3..152aa7f8 100644
--- a/stacks/owntracks/main.tf
+++ b/stacks/owntracks/main.tf
@@ -1,5 +1,5 @@
 variable "tls_secret_name" { type = string }
-variable "owntracks_credentials" { type = string }
+variable "owntracks_credentials" { type = map(string) }
 
 locals {
   tiers = {
diff --git a/stacks/tandoor/main.tf b/stacks/tandoor/main.tf
index cfa19b43..daadd224 100644
--- a/stacks/tandoor/main.tf
+++ b/stacks/tandoor/main.tf
@@ -1,6 +1,9 @@
 variable "tls_secret_name" { type = string }
 variable "tandoor_database_password" { type = string }
-variable "tandoor_email_password" { type = string }
+variable "tandoor_email_password" {
+  type    = string
+  default = ""
+}
 
 locals {
   tiers = {