diff --git a/src/main/kotlin/ru/dbotthepony/mc/otm/worldgen/placement/EnormousPlacement.kt b/src/main/kotlin/ru/dbotthepony/mc/otm/worldgen/placement/EnormousPlacement.kt
index b2580eef4..7c84d119e 100644
--- a/src/main/kotlin/ru/dbotthepony/mc/otm/worldgen/placement/EnormousPlacement.kt
+++ b/src/main/kotlin/ru/dbotthepony/mc/otm/worldgen/placement/EnormousPlacement.kt
@@ -66,20 +66,22 @@ class EnormousPlacement(
 		}
 	}
 
-	private val level2cache = WeakHashMap<WorldGenLevel, Cache<ChunkPos, GeneratedChunk>>()
-	private val lock = ReentrantLock()
+	private val level2cache = Caffeine.newBuilder()
+		.scheduler(Scheduler.systemScheduler())
+		.executor(Util.backgroundExecutor())
+		.expireAfterAccess(Duration.ofMinutes(10))
+		.weakKeys()
+		.build<WorldGenLevel, Cache<ChunkPos, GeneratedChunk>>()
 
 	private fun getCache(level: WorldGenLevel): Cache<ChunkPos, GeneratedChunk> {
-		return lock.withLock {
-			level2cache.computeIfAbsent(level) {
-				Caffeine.newBuilder()
-					.scheduler(Scheduler.systemScheduler())
-					.executor(Util.backgroundExecutor())
-					.maximumSize(16384L)
-					.expireAfterWrite(Duration.ofMinutes(5))
-					.softValues()
-					.build()
-			}
+		return level2cache.get(level) {
+			Caffeine.newBuilder()
+				.scheduler(Scheduler.systemScheduler())
+				.executor(Util.backgroundExecutor())
+				.maximumSize(16384L)
+				.expireAfterWrite(Duration.ofMinutes(5))
+				.softValues()
+				.build()
 		}
 	}