diff --git a/domains/environment_domains/variables.tf b/domains/environment_domains/variables.tf
index 815b0e8..54e8403 100644
--- a/domains/environment_domains/variables.tf
+++ b/domains/environment_domains/variables.tf
@@ -43,6 +43,7 @@ variable "exclude_cnames" {
 }
 
 variable "redirect_rules" {
+  type        = list
   nullable    = false
   default     = []
   description = <<EOF