diff --git a/hbvm/src/vm/mem/mod.rs b/hbvm/src/vm/mem/mod.rs
index bad822e..28d1382 100644
--- a/hbvm/src/vm/mem/mod.rs
+++ b/hbvm/src/vm/mem/mod.rs
@@ -154,7 +154,7 @@ impl Memory {
                                 2 => 1024_usize.pow(3),
                                 _ => unreachable!(),
                             },
-                            offset: addr as usize & ((1 << 12) - 1),
+                            offset: addr as usize & ((1 << (lvl * 9 + 12)) - 1),
                         })
                     }
                 }