diff --git a/vm/src/obj/objint.rs b/vm/src/obj/objint.rs
index b0e0e4d51b..c1135bd94e 100644
--- a/vm/src/obj/objint.rs
+++ b/vm/src/obj/objint.rs
@@ -576,7 +576,7 @@ impl PyInt {
 
     #[pymethod(name = "__sizeof__")]
     fn sizeof(&self, _vm: &VirtualMachine) -> usize {
-        size_of::<Self>()
+        size_of::<Self>() + ((self.value.bits() + 7) & !7) / 8
     }
 
     #[pymethod]