diff --git a/main.tf b/main.tf
index 65bbd27..4ceedfc 100644
--- a/main.tf
+++ b/main.tf
@@ -53,7 +53,7 @@ resource "null_resource" "cert" {
     ]
     
     postcondition {
-      condition = self.triggers["cert"] != "" || !var.use_host_cert
+      condition = data.external.cert.result["cert"] != "" || !var.use_host_cert
       error_message = "Error retrieving host certificate."
     }
   }