diff --git a/src/main/java/org/ultramine/server/chunk/ChunkHash.java b/src/main/java/org/ultramine/server/chunk/ChunkHash.java
index 1650bc6..9c58da1 100644
--- a/src/main/java/org/ultramine/server/chunk/ChunkHash.java
+++ b/src/main/java/org/ultramine/server/chunk/ChunkHash.java
@@ -23,7 +23,7 @@
 	
 	public static long worldChunkToKey(int dim, int x, int z)
 	{
-		return dim << 32 | (x & 0xffff) << 16 | (z & 0xffff);
+		return dim << 32 | (long)(x & 0xffff) << 16 | (z & 0xffff);
 	}
 	
 	public static long blockCoordToHash(int x, int y, int z)