diff --git a/tags/tags.finops.tf b/tags/tags.finops.tf
index dc8b71d..ff7fea1 100644
--- a/tags/tags.finops.tf
+++ b/tags/tags.finops.tf
@@ -24,11 +24,11 @@ resource "terraform_data" "finops" {
 
 resource "terraform_data" "finops_roles" {
   count = length(local.finops_roles) > 0 ? 1 : 0
-  input = local.finops_roles
+  input = tolist(local.finops_roles)
 
   lifecycle {
     precondition {
-      condition     = !anytrue([for r in local.finops_roles: length(regexall("[^0-9a-z_]",r)) > 0 ])
+      condition     = !anytrue([for r in tolist(local.finops_roles): length(regexall("[^0-9a-z_]",r)) > 0 ])
       error_message = "finops.roles fields can contain only 0-9, a-z, and underscore."
     }
   }