diff --git a/src/Swapper.sol b/src/Swapper.sol
index c864d8a..8e59296 100644
--- a/src/Swapper.sol
+++ b/src/Swapper.sol
@@ -39,7 +39,7 @@ contract Swapper {
     );
 
     ERC20(params.tokenIn).safeTransferFrom(msg.sender, address(this), params.amountIn);
-    ERC20(params.tokenIn).safeApprove(UNISWAP_V3_ROUTER, params.amountIn);
+    ERC20(params.tokenIn).safeIncreaseAllowance(UNISWAP_V3_ROUTER, params.amountIn);
 
     uint160 sqrtPriceX96 = (params.oracleSeconds == 0)
       ? Helper.sqrtPriceX96(swapPool)