diff --git a/program/src/mine.rs b/program/src/mine.rs
index 0a5e571..f411e80 100644
--- a/program/src/mine.rs
+++ b/program/src/mine.rs
@@ -124,15 +124,13 @@ pub fn process_mine<'a, 'info>(
     // Apply liveness penalty.
     let t_liveness = t_target.saturating_add(TOLERANCE);
     if t.gt(&t_liveness) {
-        reward = reward
-            .checked_sub(
-                reward
-                    .checked_mul(t.checked_sub(t_liveness).unwrap() as u64)
-                    .unwrap()
-                    .checked_div(ONE_MINUTE as u64)
-                    .unwrap(),
-            )
-            .unwrap();
+        reward = reward.saturating_sub(
+            reward
+                .checked_mul(t.checked_sub(t_liveness).unwrap() as u64)
+                .unwrap()
+                .checked_div(ONE_MINUTE as u64)
+                .unwrap(),
+        );
     }
 
     // Limit payout amount to whatever is left in the bus