diff --git a/program/src/mine.rs b/program/src/mine.rs
index 6e2825f..8bdc6a5 100644
--- a/program/src/mine.rs
+++ b/program/src/mine.rs
@@ -147,7 +147,7 @@ pub fn process_mine(accounts: &[AccountInfo], data: &[u8]) -> ProgramResult {
             // Apply multiplier if boost is not expired and last stake at was more than one minute ago.
             if boost.expires_at.gt(&t) && stake.last_stake_at.saturating_add(ONE_MINUTE).le(&t) {
                 let multiplier = boost.multiplier.checked_sub(1).unwrap();
-                let boost_reward = (reward as u128)
+                let boost_reward = (base_reward as u128)
                     .checked_mul(multiplier as u128)
                     .unwrap()
                     .checked_mul(stake.balance as u128)