--- a/net/minecraft/server/bossevents/CustomBossEvent.java
+++ b/net/minecraft/server/bossevents/CustomBossEvent.java
@@ -18,6 +18,10 @@
 import net.minecraft.server.level.ServerPlayer;
 import net.minecraft.util.Mth;
 import net.minecraft.world.BossEvent;
+// CraftBukkit start
+import org.bukkit.boss.KeyedBossBar;
+import org.bukkit.craftbukkit.boss.CraftKeyedBossbar;
+// CraftBukkit end
 
 public class CustomBossEvent extends ServerBossEvent {
 
@@ -25,7 +29,17 @@
     private final Set<UUID> players = Sets.newHashSet();
     private int value;
     private int max = 100;
+    // CraftBukkit start
+    private KeyedBossBar bossBar;
 
+    public KeyedBossBar getBukkitEntity() {
+        if (this.bossBar == null) {
+            this.bossBar = new CraftKeyedBossbar(this);
+        }
+        return this.bossBar;
+    }
+    // CraftBukkit end
+
     public CustomBossEvent(ResourceLocation id, Component displayName) {
         super(displayName, BossEvent.BossBarColor.WHITE, BossEvent.BossBarOverlay.PROGRESS);
         this.id = id;