diff --git a/model-datastructure/src/commonMain/kotlin/org/modelix/model/lazy/NonWrittenEntry.kt b/model-datastructure/src/commonMain/kotlin/org/modelix/model/lazy/NonWrittenEntry.kt
index 9945def968..72fb271f76 100644
--- a/model-datastructure/src/commonMain/kotlin/org/modelix/model/lazy/NonWrittenEntry.kt
+++ b/model-datastructure/src/commonMain/kotlin/org/modelix/model/lazy/NonWrittenEntry.kt
@@ -37,4 +37,8 @@ class NonWrittenEntry<E : IKVValue> : IKVEntryReference<E> {
             deserialized.isWritten = true
         }
     }
+
+    override fun toString(): String {
+        return hash
+    }
 }
diff --git a/model-datastructure/src/commonMain/kotlin/org/modelix/model/lazy/WrittenEntry.kt b/model-datastructure/src/commonMain/kotlin/org/modelix/model/lazy/WrittenEntry.kt
index a5c466e135..9909bf2c07 100644
--- a/model-datastructure/src/commonMain/kotlin/org/modelix/model/lazy/WrittenEntry.kt
+++ b/model-datastructure/src/commonMain/kotlin/org/modelix/model/lazy/WrittenEntry.kt
@@ -30,4 +30,8 @@ class WrittenEntry<E : IKVValue>(
     override fun write(store: IDeserializingKeyValueStore) {}
 
     override fun getDeserializer(): (String) -> E = deserializer
+
+    override fun toString(): String {
+        return hash
+    }
 }