diff --git a/test/demo-contracts/UniswapV2SwapRenamed.DAI.sol b/test/demo-contracts/UniswapV2SwapRenamed.DAI.sol
index abc875a..7605879 100644
--- a/test/demo-contracts/UniswapV2SwapRenamed.DAI.sol
+++ b/test/demo-contracts/UniswapV2SwapRenamed.DAI.sol
@@ -18,7 +18,8 @@ contract dAIMock {
     event transferEvent(address indexed src, address indexed dst, uint wad);
 
     function decimals() external returns (uint8) {
-        return 18;
+        uint8 dec = 18;
+        return dec;
     }
 
     function mint(address usr, uint wad) public {
diff --git a/test/demo-contracts/UniswapV2SwapRenamed.USDC.sol b/test/demo-contracts/UniswapV2SwapRenamed.USDC.sol
index b9985c0..36108b8 100644
--- a/test/demo-contracts/UniswapV2SwapRenamed.USDC.sol
+++ b/test/demo-contracts/UniswapV2SwapRenamed.USDC.sol
@@ -17,7 +17,8 @@ contract uSDCMock {
     event approvalEvent(address indexed owner, address indexed spender, uint256 value);
 
     function decimals() external returns (uint8) {
-        return 18;
+        uint8 dec = 18;
+        return dec;
     }
 
     function mint(address account, uint256 value) public {
diff --git a/test/demo-contracts/UniswapV2SwapRenamed.WETH.sol b/test/demo-contracts/UniswapV2SwapRenamed.WETH.sol
index 31184a0..f078118 100644
--- a/test/demo-contracts/UniswapV2SwapRenamed.WETH.sol
+++ b/test/demo-contracts/UniswapV2SwapRenamed.WETH.sol
@@ -16,7 +16,8 @@ contract wETHMock {
     event transferEvent(address indexed from, address indexed to, uint256 value);
 
     function decimals() external returns (uint8) {
-        return 18;
+        uint8 dec = 18;
+        return dec;
     }
 
     function deposit() external payable {