diff --git a/src/main/java/fr/insa/clavardator/users/User.java b/src/main/java/fr/insa/clavardator/users/User.java
index dcf4975..6e42ec2 100644
--- a/src/main/java/fr/insa/clavardator/users/User.java
+++ b/src/main/java/fr/insa/clavardator/users/User.java
@@ -26,4 +26,8 @@ public class User implements Serializable {
 	}
 
 
+	@Override
+	public int compareTo(@NotNull User o) {
+		return username.compareTo(o.username);
+	}
 }