diff --git a/xhcid/src/xhci/device.rs b/xhcid/src/xhci/device.rs
index 82f8608699..362549468e 100644
--- a/xhcid/src/xhci/device.rs
+++ b/xhcid/src/xhci/device.rs
@@ -1,5 +1,5 @@
 use syscall::error::Result;
-use syscall::io::Dma;
+use syscall::io::{Dma, Mmio};
 
 #[repr(packed)]
 pub struct SlotContext {