diff --git a/devices/src/usb/xhci/device_slot.rs b/devices/src/usb/xhci/device_slot.rs
index e2b5e5d06c..22cfb1d149 100644
--- a/devices/src/usb/xhci/device_slot.rs
+++ b/devices/src/usb/xhci/device_slot.rs
@@ -229,7 +229,7 @@ impl PortId {
         *self.0.lock() = 0;
     }
 
-    fn get(&self) -> Result<(u8)> {
+    fn get(&self) -> Result<u8> {
         let val = *self.0.lock();
         if val == 0 {
             return Err(Error::BadPortId(val));
diff --git a/x86_64/src/lib.rs b/x86_64/src/lib.rs
index bb5b675beb..a2fdf27653 100644
--- a/x86_64/src/lib.rs
+++ b/x86_64/src/lib.rs
@@ -631,7 +631,7 @@ impl X8664arch {
         exit_evt: EventFd,
         pci: Option<Arc<Mutex<devices::PciConfigIo>>>,
         mem_size: u64,
-    ) -> Result<(devices::Bus)> {
+    ) -> Result<devices::Bus> {
         struct NoDevice;
         impl devices::BusDevice for NoDevice {
             fn debug_label(&self) -> String {