diff --git a/rcljava_examples/src/main/java/org/ros2/rcljava/examples/client/AddTwoIntsClient.java b/rcljava_examples/src/main/java/org/ros2/rcljava/examples/client/AddTwoIntsClient.java
index d8357a6..2369be6 100644
--- a/rcljava_examples/src/main/java/org/ros2/rcljava/examples/client/AddTwoIntsClient.java
+++ b/rcljava_examples/src/main/java/org/ros2/rcljava/examples/client/AddTwoIntsClient.java
@@ -42,6 +42,8 @@ public static void main(final String[] args) throws InterruptedException, Except
       Future<example_interfaces.srv.AddTwoInts_Response> future =
           client.asyncSendRequest(request);
 
+      RCLJava.spinUntilComplete(node, future);
+
       System.out.println(
           "result of " + request.getA() + " + " + request.getB() + " = " + future.get().getSum());
     }