diff --git a/test/ERC20.t.sol b/test/ERC20.t.sol
index 4b6798d..ce68c5e 100644
--- a/test/ERC20.t.sol
+++ b/test/ERC20.t.sol
@@ -3,11 +3,13 @@ pragma solidity ^0.8.13;
 
 import {Test} from "forge-std/Test.sol";
 import {SymTest} from "halmos-cheatcodes/SymTest.sol";
+import {IERC20} from "forge-std/interfaces/IERC20.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 --array-lengths staticcalls=2  --loop 256
+/// @custom:halmos --storage-layout=generic --array-lengths senders=2 --loop 256
 contract ERC20Test is Test, SymTest {
     ERC20OpenZeppelin public openzeppelin;
     ERC20Solady public solady;
@@ -20,9 +22,28 @@ contract ERC20Test is Test, SymTest {
         openzeppelin = new ERC20OpenZeppelin("Token", "TOK", 6);
         solady = new ERC20Solady("Token", "TOK", 6);
         solmate = new ERC20Solmate("Token", "TOK", 6);
+
+        staticcallSelectors = [
+            IERC20.balanceOf.selector,
+            IERC20.allowance.selector,
+            IERC20.name.selector,
+            IERC20.symbol.selector,
+            IERC20.decimals.selector,
+            IERC20.totalSupply.selector
+        ];
+
+        callSelectors = [
+            IERC20.transfer.selector,
+            IERC20.approve.selector,
+            IERC20.transferFrom.selector,
+            MockERC20.burn.selector,
+            MockERC20.mint.selector
+        ];
     }
 
-    function check_differential_erc20(address[] memory senders, uint256[] memory staticcalls) public {
+    function check_differential_erc20(address[] memory senders, uint256 n_staticcalls) public {
+        vm.assume(n_staticcalls <= staticcallSelectors.length);
+
         address[3] memory contracts = [address(openzeppelin), address(solady), address(solmate)];
 
         bytes[] memory results;
@@ -30,9 +51,10 @@ contract ERC20Test is Test, SymTest {
         results = new bytes[](senders.length);
         for (uint256 j = 0; j < senders.length; j++) {
             for (uint256 i = 0; i < contracts.length; i++) {
+                bytes memory call = svm.createCalldata("MockERC20");
                 vm.prank(senders[j]);
-                (bool _success, bytes memory _result) = contracts[i].call(svm.createCalldata("MockERC20"));
-                require(_success);
+                (bool _success, bytes memory _result) = contracts[i].call(call);
+                vm.assume(_success);
                 if (i == 0) {
                     results[i] = _result;
                 } else {
@@ -41,11 +63,12 @@ contract ERC20Test is Test, SymTest {
             }
         }
 
-        results = new bytes[](staticcalls.length);
-        for (uint256 j = 0; j < staticcalls.length; j++) {
+        results = new bytes[](n_staticcalls);
+        for (uint256 j = 0; j < n_staticcalls; j++) {
             for (uint256 i = 0; i < contracts.length; i++) {
-                (bool _success, bytes memory _result) = contracts[i].staticcall(svm.createCalldata("MockERC20", true));
-                require(_success);
+                bytes memory staticcall = svm.createCalldata("MockERC20", true);
+                (bool _success, bytes memory _result) = contracts[i].staticcall(staticcall);
+                vm.assume(_success);
                 if (i == 0) {
                     results[i] = _result;
                 } else {