diff --git a/vm-device/src/bus.rs b/vm-device/src/bus.rs
index bf377154d..c7f415cec 100644
--- a/vm-device/src/bus.rs
+++ b/vm-device/src/bus.rs
@@ -85,7 +85,7 @@ impl Ord for BusRange {
 
 impl PartialOrd for BusRange {
     fn partial_cmp(&self, other: &BusRange) -> Option<Ordering> {
-        self.base.partial_cmp(&other.base)
+        Some(self.cmp(other))
     }
 }