diff --git a/kvm/src/lib.rs b/kvm/src/lib.rs
index 32bee6c24e..beaad55ed7 100644
--- a/kvm/src/lib.rs
+++ b/kvm/src/lib.rs
@@ -241,7 +241,7 @@ impl AsRawFd for Kvm {
 }
 
 /// An address either in programmable I/O space or in memory mapped I/O space.
-#[derive(Copy, Clone, MsgOnSocket)]
+#[derive(Copy, Clone, Debug, MsgOnSocket)]
 pub enum IoeventAddress {
     Pio(u64),
     Mmio(u64),