diff --git a/EssentialsGroupManager/src/org/anjocaido/groupmanager/data/User.java b/EssentialsGroupManager/src/org/anjocaido/groupmanager/data/User.java
index b1b2c6985..a7e5cdc8b 100644
--- a/EssentialsGroupManager/src/org/anjocaido/groupmanager/data/User.java
+++ b/EssentialsGroupManager/src/org/anjocaido/groupmanager/data/User.java
@@ -28,7 +28,7 @@ public class User extends DataUnit implements Cloneable {
      *
      */
 	private String group = null;
-	private List<String> subGroups = Collections.synchronizedList(Collections.<String>emptyList());
+	private final List<String> subGroups = Collections.synchronizedList(Collections.<String>emptyList());
 	/**
 	 * This one holds the fields in INFO node. like prefix = 'c' or build =
 	 * false