diff --git a/contracts/libraries/Math.sol b/contracts/libraries/Math.sol
index d67525a..197d836 100644
--- a/contracts/libraries/Math.sol
+++ b/contracts/libraries/Math.sol
@@ -7,15 +7,14 @@ library Math {
     }
 
     // based on https://github.com/ethereum/dapp-bin/blob/11f05fc9e3f31a00d57982bc2f65ef2654f1b569/library/math.sol#L28 via https://github.com/ethereum/dapp-bin/pull/50
-    function sqrt(uint256 x) internal pure returns (uint256) {
+    function sqrt(uint256 x) internal pure returns (uint256 y) {
         if (x == 0) return 0;
         else if (x <= 3) return 1;
         uint256 z = (x + 1) / 2;
-        uint256 y = x;
+        y = x;
         while (z < y) {
             y = z;
             z = (x / z + z) / 2;
         }
-        return y;
     }
 }
diff --git a/test/UniswapV2.ts b/test/UniswapV2.ts
index 729c333..c13da42 100644
--- a/test/UniswapV2.ts
+++ b/test/UniswapV2.ts
@@ -39,10 +39,10 @@ describe('UniswapV2', () => {
   })
 
   it('mintLiquidity', async () => {
-    await token0.transfer(exchange.address, decimalize(1))
+    await token0.transfer(exchange.address, decimalize(4))
     await token1.transfer(exchange.address, decimalize(1))
     await expect(exchange.connect(wallet).mintLiquidity(wallet.address))
       .to.emit(exchange, 'LiquidityMinted')
-      .withArgs(wallet.address, wallet.address, decimalize(1), decimalize(1), decimalize(1))
+      .withArgs(wallet.address, wallet.address, decimalize(2), decimalize(4), decimalize(1))
   })
 })