diff --git a/shiroha-server/src/main/java/io/nanachiyo0721/shiroha/utils/ReferenceCountingChunkLoader.java b/shiroha-server/src/main/java/io/nanachiyo0721/shiroha/utils/ReferenceCountingChunkLoader.java
index 10c8c11..142827f 100644
--- a/shiroha-server/src/main/java/io/nanachiyo0721/shiroha/utils/ReferenceCountingChunkLoader.java
+++ b/shiroha-server/src/main/java/io/nanachiyo0721/shiroha/utils/ReferenceCountingChunkLoader.java
@@ -254,9 +254,7 @@ public class ReferenceCountingChunkLoader {
 
     private static final class ReferenceCountData {
 
-        private static final AtomicLong ID_GENERATOR = new AtomicLong();
-
-        private final long id = ID_GENERATOR.getAndIncrement();
+        private final long id = ChunkTaskScheduler.getNextChunkLoadId();
 
         public final AtomicLong referenceCount = new AtomicLong(1L);
         public final AtomicLong referenceTTL = new AtomicLong(MAX_CHUNK_TTL_TICKS);