diff --git a/pci/src/msi.rs b/pci/src/msi.rs
index fdaa36562..5a6b07b51 100644
--- a/pci/src/msi.rs
+++ b/pci/src/msi.rs
@@ -179,7 +179,7 @@ struct MsiConfigState {
 impl VersionMapped for MsiConfigState {}
 
 pub struct MsiConfig {
-    cap: MsiCap,
+    pub cap: MsiCap,
     interrupt_source_group: Arc<dyn InterruptSourceGroup>,
 }