diff --git a/li.strolch.model/src/main/java/li/strolch/model/StrolchValueType.java b/li.strolch.model/src/main/java/li/strolch/model/StrolchValueType.java
index 76531a541..56446cdc6 100644
--- a/li.strolch.model/src/main/java/li/strolch/model/StrolchValueType.java
+++ b/li.strolch.model/src/main/java/li/strolch/model/StrolchValueType.java
@@ -539,9 +539,9 @@ public enum StrolchValueType {
 		}
 	};
 
-	private String type;
+	private final String type;
 
-	private StrolchValueType(String type) {
+	StrolchValueType(String type) {
 		this.type = type;
 	}