diff --git a/acmpca/certificate.tf b/acmpca/certificate.tf
index 2c01577..c9baf22 100644
--- a/acmpca/certificate.tf
+++ b/acmpca/certificate.tf
@@ -40,7 +40,7 @@ resource "tls_cert_request" "certificate" {
 
   lifecycle {
     precondition {
-      condition     = var.certificate_cn != null && local.cert_dns != null
+      condition     = var.certificate_cn != null || local.cert_dns != null
       error_message = "One of the certificate_cn or certificate_dns must be provided and not null."
     }
   }