diff --git a/pdf-umbenenner-domain/src/test/java/de/gecheckt/pdf/umbenenner/domain/model/RunIdTest.java b/pdf-umbenenner-domain/src/test/java/de/gecheckt/pdf/umbenenner/domain/model/RunIdTest.java
index 8ab856c..4f5a001 100644
--- a/pdf-umbenenner-domain/src/test/java/de/gecheckt/pdf/umbenenner/domain/model/RunIdTest.java
+++ b/pdf-umbenenner-domain/src/test/java/de/gecheckt/pdf/umbenenner/domain/model/RunIdTest.java
@@ -70,6 +70,13 @@ class RunIdTest {
         assertNotEquals("test-id", runId);
     }
 
+    @Test
+    void equals_returnsFalseWhenComparedWithDifferentClass() {
+        RunId runId = new RunId("test-id");
+        Object other = new Object();
+        assertNotEquals(runId, other);
+    }
+
     @Test
     void hashCode_isSameForIdenticalValues() {
         RunId runId1 = new RunId("same-id");