diff --git a/src/ReservoirPair.sol b/src/ReservoirPair.sol
index 38052cc7..ead56bc7 100644
--- a/src/ReservoirPair.sol
+++ b/src/ReservoirPair.sol
@@ -156,7 +156,7 @@ abstract contract ReservoirPair is IAssetManagedPair, ReservoirERC20 {
             lTimeElapsed = lBlockTimestamp - aBlockTimestampLast;
         }
         if (lTimeElapsed > 0 && aReserve0 != 0 && aReserve1 != 0) {
-            _updateOracle(aReserve0, aReserve1, lTimeElapsed, aBlockTimestampLast);
+            _updateOracle(aReserve0, aReserve1, lTimeElapsed, lBlockTimestamp);
         }
 
         // update reserves to match latest balances