diff --git a/java/google/registry/dns/writer/clouddns/BUILD b/java/google/registry/dns/writer/clouddns/BUILD
index 6c6be6b24..60bab7eca 100644
--- a/java/google/registry/dns/writer/clouddns/BUILD
+++ b/java/google/registry/dns/writer/clouddns/BUILD
@@ -8,6 +8,7 @@ licenses(["notice"])  # Apache 2.0
 java_library(
     name = "clouddns",
     srcs = glob(["*.java"]),
+    compatible_with = ["//buildenv/target:appengine"],
     deps = [
         "//apiserving/discoverydata/cloud/dns:cloud_dns_v2beta1_versioned",
         "//java/com/google/api/client/googleapis/json",