diff --git a/src/main/java/org/elasticsearch/alerts/AlertingModule.java b/src/main/java/org/elasticsearch/alerts/AlertingModule.java
index 4b4eb3205e2..597b2c21230 100644
--- a/src/main/java/org/elasticsearch/alerts/AlertingModule.java
+++ b/src/main/java/org/elasticsearch/alerts/AlertingModule.java
@@ -15,6 +15,7 @@ import org.elasticsearch.alerts.rest.RestDeleteAlertAction;
 import org.elasticsearch.alerts.rest.RestGetAlertAction;
 import org.elasticsearch.alerts.rest.RestPutAlertAction;
 import org.elasticsearch.alerts.scheduler.AlertScheduler;
+import org.elasticsearch.alerts.transport.actions.ack.TransportAckAlertAction;
 import org.elasticsearch.alerts.transport.actions.delete.TransportDeleteAlertAction;
 import org.elasticsearch.alerts.transport.actions.get.TransportGetAlertAction;
 import org.elasticsearch.alerts.transport.actions.put.TransportPutAlertAction;
@@ -41,6 +42,7 @@ public class AlertingModule extends AbstractModule {
         bind(TransportDeleteAlertAction.class).asEagerSingleton();
         bind(TransportGetAlertAction.class).asEagerSingleton();
         bind(TransportAlertStatsAction.class).asEagerSingleton();
+        bind(TransportAckAlertAction.class).asEagerSingleton();
         bind(AlertsClient.class).to(NodeAlertsClient.class).asEagerSingleton();
 
         // Rest layer
diff --git a/src/main/java/org/elasticsearch/alerts/transport/actions/ack/AckAlertResponse.java b/src/main/java/org/elasticsearch/alerts/transport/actions/ack/AckAlertResponse.java
index 5c917dddee6..e65310cd12f 100644
--- a/src/main/java/org/elasticsearch/alerts/transport/actions/ack/AckAlertResponse.java
+++ b/src/main/java/org/elasticsearch/alerts/transport/actions/ack/AckAlertResponse.java
@@ -46,7 +46,7 @@ public class AckAlertResponse extends ActionResponse {
     public void readFrom(StreamInput in) throws IOException {
         super.readFrom(in);
         if (in.readBoolean()) {
-            AlertAckState.fromString(in.readString());
+            alertAckState = AlertAckState.fromString(in.readString());
         }
     }