diff --git a/devices/src/lib.rs b/devices/src/lib.rs
index 21378fc42..4d2f260a0 100644
--- a/devices/src/lib.rs
+++ b/devices/src/lib.rs
@@ -43,5 +43,6 @@ bitflags! {
         const CPU_DEVICES_CHANGED = 0b1;
         const MEMORY_DEVICES_CHANGED = 0b10;
         const PCI_DEVICES_CHANGED = 0b100;
+        const POWER_BUTTON_CHANGED = 0b1000;
     }
 }