diff --git a/src/main/java/org/ultramine/server/chunk/OffHeapChunkStorage.java b/src/main/java/org/ultramine/server/chunk/OffHeapChunkStorage.java
index 968cb54..893b723 100644
--- a/src/main/java/org/ultramine/server/chunk/OffHeapChunkStorage.java
+++ b/src/main/java/org/ultramine/server/chunk/OffHeapChunkStorage.java
@@ -57,7 +57,7 @@
 	
 	public long getTotalMemory()
 	{
-		return slots*SLOT_SIZE;
+		return (long)slots*SLOT_SIZE;
 	}
 	
 	public long getUsedMemory()