diff --git a/src/main/java/cloud/dnation/jenkins/plugins/hetzner/shutdown/BeforeHourWrapsPolicy.java b/src/main/java/cloud/dnation/jenkins/plugins/hetzner/shutdown/BeforeHourWrapsPolicy.java
index 2d0c84f..3212edf 100644
--- a/src/main/java/cloud/dnation/jenkins/plugins/hetzner/shutdown/BeforeHourWrapsPolicy.java
+++ b/src/main/java/cloud/dnation/jenkins/plugins/hetzner/shutdown/BeforeHourWrapsPolicy.java
@@ -41,6 +41,11 @@ public BeforeHourWrapsPolicy() {
         super(STRATEGY_SINGLETON);
     }
 
+    @SuppressWarnings("rawtypes")
+    @Override
+    public RetentionStrategy<AbstractCloudComputer> getRetentionStrategy() {
+        return STRATEGY_SINGLETON;
+    }
 
     @SuppressWarnings("rawtypes")
     private static class RetentionStrategyImpl extends RetentionStrategy<AbstractCloudComputer> {