diff --git a/ces_app_basic/main.tf b/ces_app_basic/main.tf
index 50468d27..e129bf66 100644
--- a/ces_app_basic/main.tf
+++ b/ces_app_basic/main.tf
@@ -177,7 +177,7 @@ variable_declarations {
   client_certificate_settings {
     tls_certificate = file("test-fixtures/cert.pem")
     private_key = google_secret_manager_secret_version.fake_secret_version.name
-    passphrase = "fakepassphrase"
+    passphrase = google_secret_manager_secret_version.fake_secret_version.name
   }
 
   # Root agent should not be specified when creating an app