diff --git a/libs/bao1x-api/src/api.rs b/libs/bao1x-api/src/api.rs
index 1d7e17bad..a3b4edb3b 100644
--- a/libs/bao1x-api/src/api.rs
+++ b/libs/bao1x-api/src/api.rs
@@ -51,6 +51,9 @@ pub enum HalOpcode {
     ConfigureIoxIrq = 11,
     IrqLocalHandler = 12,
 
+    /// Manipulate the OS timer
+    SetPreemptionState = 64,
+
     /// Exit server
     Quit = 255,