diff --git a/src/Treasury.sol b/src/Treasury.sol
index f44197a..2292fcb 100644
--- a/src/Treasury.sol
+++ b/src/Treasury.sol
@@ -83,14 +83,14 @@ contract GhostTreasury is GhostAccessControlled, ITreasury {
         uint48 phantomRelease,
         uint256 gasSpent,
         uint256 registryIndex
-    ) external override returns (uint256 gasValue) {
+    ) external override {
         if (!_permissions[STATUS.STAKING][msg.sender]) revert NotApproved();
 
         address reserveToken = _registry[STATUS.RESERVETOKEN].at(registryIndex);
         if (!_permissions[STATUS.RESERVETOKEN][reserveToken]) revert NotApproved();
 
         uint256 totalSupply = IERC20(FTSO).totalSupply();
-        gasValue = tokenValue(reserveToken, gasSpent);
+        uint256 gasValue = tokenValue(reserveToken, gasSpent);
         gasValue = FullMath.mulDiv(gasValue, totalSupply, totalReserves);
 
         if (gasValue > 0 && gasValue <= excessReserves()) {
diff --git a/src/interfaces/ITreasury.sol b/src/interfaces/ITreasury.sol
index dcc87d1..347f065 100644
--- a/src/interfaces/ITreasury.sol
+++ b/src/interfaces/ITreasury.sol
@@ -30,7 +30,7 @@ interface ITreasury {
     ) external returns (uint256);
 
     function registered(STATUS status, address token) external view returns(bool);
-    function phantomRefund(address receiver, uint48 phantomExpiry, uint256 gasSpent, uint256 amount) external returns (uint256);
+    function phantomRefund(address receiver, uint48 phantomExpiry, uint256 gasSpent, uint256 amount) external;
     function buyBack(address receiver, uint256 amount, uint256 index) external returns (address, uint256);
     function withdraw(address token, uint256 amount) external;
     function mint(address _recipient, uint256 _amount) external;