diff --git a/contracts/OverlayV1Market.sol b/contracts/OverlayV1Market.sol
index f76f0afa..7ec073f0 100644
--- a/contracts/OverlayV1Market.sol
+++ b/contracts/OverlayV1Market.sol
@@ -342,7 +342,7 @@ contract OverlayV1Market is IOverlayV1Market {
 
             // subtract unwound open interest from the side's aggregate oi value
             // and decrease number of oi shares issued
-            _reduceOIAndOIShares(pos, fraction);
+            _reduceOIAndOIShares(pos, fraction, oiTotalOnSide, oiTotalSharesOnSide);
 
             // register the amount to be minted/burned
             // capPayoff prevents overflow reverts with int256 cast
@@ -433,7 +433,7 @@ contract OverlayV1Market is IOverlayV1Market {
 
             // subtract liquidated open interest from the side's aggregate oi value
             // and decrease number of oi shares issued
-            _reduceOIAndOIShares(pos, fraction);
+            _reduceOIAndOIShares(pos, fraction, oiTotalOnSide, oiTotalSharesOnSide);
 
             // register the amount to be burned
             _registerMintOrBurn(int256(value) - int256(cost) - int256(marginToBurn));
@@ -728,7 +728,12 @@ contract OverlayV1Market is IOverlayV1Market {
 
     /// @notice subtract open interest from the side's aggregate oi value
     /// @notice and decrease number of oi shares issued
-    function _reduceOIAndOIShares(Position.Info memory pos, uint256 fraction) internal {
+    function _reduceOIAndOIShares(
+        Position.Info memory pos,
+        uint256 fraction,
+        uint256 oiTotalOnSide,
+        uint256 oiTotalSharesOnSide
+    ) internal {
         // NOTE: use subFloor to avoid reverts with oi rounding issues
         if (pos.isLong) {
             oiLong = oiLong.subFloor(