diff --git a/api/src/lib.rs b/api/src/lib.rs
index 84c6b71..d8812f8 100644
--- a/api/src/lib.rs
+++ b/api/src/lib.rs
@@ -10,4 +10,4 @@ pub(crate) use ore_utils as utils;
 use solana_program::declare_id;
 
 // declare_id!("mineRHF5r6S7HyD9SppBfVMXMavDkJsxwGesEvxZr2A");
-declare_id!("6NSA5s2mk5fJctfoKxWoewFpT4uwtZpBAVd6DHyMk8Zi");
+declare_id!("Fb9XVEimYj5KzVL6mLdbah3CGYmGP881uddBahui5RHt");
diff --git a/program/src/mine.rs b/program/src/mine.rs
index 9e1a90e..314d6b4 100644
--- a/program/src/mine.rs
+++ b/program/src/mine.rs
@@ -131,7 +131,7 @@ pub fn process_mine<'a, 'info>(
         .unwrap();
     sol_log(&format!("ratio: {}", ratio));
     if t.gt(&t_liveness) {
-        let reward_diff = reward.checked_sub(ratio).unwrap();
+        let reward_diff = reward.saturating_sub(ratio);
         sol_log(&format!("reward_diff: {}", reward_diff));
         reward = reward_diff;
     }