diff --git a/src/main/java/emu/grasscutter/game/player/PlayerBirthday.java b/src/main/java/emu/grasscutter/game/player/PlayerBirthday.java
index 733f58ee5..13a8e7c58 100644
--- a/src/main/java/emu/grasscutter/game/player/PlayerBirthday.java
+++ b/src/main/java/emu/grasscutter/game/player/PlayerBirthday.java
@@ -1,7 +1,9 @@
 package emu.grasscutter.game.player;
 
+import dev.morphia.annotations.Entity;
 import emu.grasscutter.net.proto.BirthdayOuterClass.Birthday;
 
+@Entity
 public class PlayerBirthday {
     private int day;
     private int month;