diff --git a/hawkbit-repository/hawkbit-repository-api/src/main/java/org/eclipse/hawkbit/repository/Identifiable.java b/hawkbit-repository/hawkbit-repository-api/src/main/java/org/eclipse/hawkbit/repository/Identifiable.java
index ea1f4336f..6c6ce7552 100644
--- a/hawkbit-repository/hawkbit-repository-api/src/main/java/org/eclipse/hawkbit/repository/Identifiable.java
+++ b/hawkbit-repository/hawkbit-repository-api/src/main/java/org/eclipse/hawkbit/repository/Identifiable.java
@@ -10,6 +10,7 @@ package org.eclipse.hawkbit.repository;
 
 import java.io.Serializable;
 
+@FunctionalInterface
 public interface Identifiable<T extends Serializable> {
 
     T getId();