diff --git a/gcloud-java-datastore/src/main/java/com/google/gcloud/spi/DefaultDatastoreRpc.java b/gcloud-java-datastore/src/main/java/com/google/gcloud/spi/DefaultDatastoreRpc.java
index 028027f4bc33..4771895eec99 100644
--- a/gcloud-java-datastore/src/main/java/com/google/gcloud/spi/DefaultDatastoreRpc.java
+++ b/gcloud-java-datastore/src/main/java/com/google/gcloud/spi/DefaultDatastoreRpc.java
@@ -69,6 +69,7 @@ public DefaultDatastoreRpc(DatastoreOptions options) {
     String normalizedHost = normalizeHost(options.host());
     client = DatastoreFactory.get().create(
         new Builder()
+            .transport(options.httpTransportFactory().create())
             .dataset(options.projectId())
             .host(normalizedHost)
             .initializer(options.httpRequestInitializer())