diff --git a/google-cloud-datastore/src/main/java/com/google/cloud/datastore/DatastoreOptions.java b/google-cloud-datastore/src/main/java/com/google/cloud/datastore/DatastoreOptions.java
index ddd32c3d7adf..f63892affdaa 100644
--- a/google-cloud-datastore/src/main/java/com/google/cloud/datastore/DatastoreOptions.java
+++ b/google-cloud-datastore/src/main/java/com/google/cloud/datastore/DatastoreOptions.java
@@ -18,6 +18,8 @@
 
 import static com.google.cloud.datastore.Validator.validateNamespace;
 
+import com.google.api.client.http.HttpRequest;
+import com.google.api.client.http.HttpRequestInitializer;
 import com.google.cloud.HttpServiceOptions;
 import com.google.cloud.datastore.spi.DatastoreRpc;
 import com.google.cloud.datastore.spi.DatastoreRpcFactory;
@@ -25,6 +27,7 @@
 import com.google.common.base.MoreObjects;
 import com.google.common.collect.ImmutableSet;
 
+import java.io.IOException;
 import java.lang.reflect.Method;
 import java.util.Objects;
 import java.util.Set;
@@ -90,6 +93,18 @@ private DatastoreOptions(Builder builder) {
     namespace = builder.namespace != null ? builder.namespace : defaultNamespace();
   }
 
+  @Override
+  public HttpRequestInitializer httpRequestInitializer() {
+    final HttpRequestInitializer delegate = super.httpRequestInitializer();
+    return new HttpRequestInitializer() {
+      @Override
+      public void initialize(HttpRequest httpRequest) throws IOException {
+        delegate.initialize(httpRequest);
+        httpRequest.getHeaders().setUserAgent(applicationName());
+      }
+    };
+  }
+
   @Override
   protected String defaultHost() {
     String host = System.getProperty(