diff --git a/vmm/src/device_manager.rs b/vmm/src/device_manager.rs
index d8c57847a..bad43d19f 100644
--- a/vmm/src/device_manager.rs
+++ b/vmm/src/device_manager.rs
@@ -4185,7 +4185,7 @@ impl DeviceManager {
             if !pci_device_node.children.is_empty() {
                 assert_eq!(pci_device_node.children.len(), 1);
                 let child_id = &pci_device_node.children[0];
-                id = child_id.clone();
+                id.clone_from(child_id);
             }
         }
         for child in pci_device_node.children.iter() {
diff --git a/vmm/src/device_tree.rs b/vmm/src/device_tree.rs
index 976cc6ab6..66da13d35 100644
--- a/vmm/src/device_tree.rs
+++ b/vmm/src/device_tree.rs
@@ -175,7 +175,7 @@ mod tests {
 
         // Check get_mut()
         let node = device_tree.get_mut(&id).unwrap();
-        node.id = id2.clone();
+        node.id.clone_from(&id2);
         let node = device_tree.0.get(&id).unwrap();
         assert_eq!(node.id, id2);