diff --git a/test/ERC20.t.sol b/test/ERC20.t.sol
index 11c55ba..4b6798d 100644
--- a/test/ERC20.t.sol
+++ b/test/ERC20.t.sol
@@ -6,9 +6,8 @@ import {SymTest} from "halmos-cheatcodes/SymTest.sol";
 import {ERC20OpenZeppelin} from "@src/ERC20OpenZeppelin.sol";
 import {ERC20Solady} from "@src/ERC20Solady.sol";
 import {ERC20Solmate} from "@src/ERC20Solmate.sol";
-import {MockERC20} from "@solmate/test/utils/mocks/MockERC20.sol";
 
-/// @custom:halmos --storage-layout=generic --array-lengths senders=2 --loop 256
+/// @custom:halmos --storage-layout=generic --array-lengths senders=2 --array-lengths staticcalls=2  --loop 256
 contract ERC20Test is Test, SymTest {
     ERC20OpenZeppelin public openzeppelin;
     ERC20Solady public solady;
@@ -23,15 +22,13 @@ contract ERC20Test is Test, SymTest {
         solmate = new ERC20Solmate("Token", "TOK", 6);
     }
 
-    function check_differential_erc20(address[] memory senders, uint256 calls, uint256 staticcalls) public {
-        vm.assume(senders.length == calls);
-
+    function check_differential_erc20(address[] memory senders, uint256[] memory staticcalls) public {
         address[3] memory contracts = [address(openzeppelin), address(solady), address(solmate)];
 
         bytes[] memory results;
 
-        results = new bytes[](calls);
-        for (uint256 j = 0; j < calls; j++) {
+        results = new bytes[](senders.length);
+        for (uint256 j = 0; j < senders.length; j++) {
             for (uint256 i = 0; i < contracts.length; i++) {
                 vm.prank(senders[j]);
                 (bool _success, bytes memory _result) = contracts[i].call(svm.createCalldata("MockERC20"));
@@ -44,8 +41,8 @@ contract ERC20Test is Test, SymTest {
             }
         }
 
-        results = new bytes[](staticcalls);
-        for (uint256 j = 0; j < staticcalls; j++) {
+        results = new bytes[](staticcalls.length);
+        for (uint256 j = 0; j < staticcalls.length; j++) {
             for (uint256 i = 0; i < contracts.length; i++) {
                 (bool _success, bytes memory _result) = contracts[i].staticcall(svm.createCalldata("MockERC20", true));
                 require(_success);