diff --git a/src/dragonball/dbs_interrupt/src/kvm/mod.rs b/src/dragonball/dbs_interrupt/src/kvm/mod.rs
index 40a9e7744d..0abd11b962 100644
--- a/src/dragonball/dbs_interrupt/src/kvm/mod.rs
+++ b/src/dragonball/dbs_interrupt/src/kvm/mod.rs
@@ -199,7 +199,7 @@ impl KvmIrqRouting {
         // Allocate enough buffer memory.
         let elem_sz = std::mem::size_of::<kvm_irq_routing>();
         let total_sz = std::mem::size_of::<kvm_irq_routing_entry>() * routes.len() + elem_sz;
-        let elem_cnt = (total_sz + elem_sz - 1) / elem_sz;
+        let elem_cnt = total_sz.div_ceil(elem_sz);
         let mut irq_routings = Vec::<kvm_irq_routing>::with_capacity(elem_cnt);
         irq_routings.resize_with(elem_cnt, Default::default);