diff --git a/src/macros.rs b/src/macros.rs
index 92e2179e..cf5b1891 100644
--- a/src/macros.rs
+++ b/src/macros.rs
@@ -484,6 +484,6 @@ macro_rules! heap_index {
 
 macro_rules! cell_index {
     ($idx:expr) => {
-        (($idx) / std::mem::size_of::<HeapCellValue>())
+        ($idx) / std::mem::size_of::<HeapCellValue>()
     };
 }