diff --git a/README.md b/README.md
index 0661fa6..155c474 100644
--- a/README.md
+++ b/README.md
@@ -60,8 +60,8 @@ yarn test
 | Contract         | Gas Cost  |
 | ---------------- | --------- |
 | SolmateERC20     | 74172     |
-| YulERC20         | 73782     |
-| YulERC20External | **73770** |
+| YulERC20         | 73774     |
+| YulERC20External | **73762** |
 
 ### transfer
 
diff --git a/contracts/ERC20.sol b/contracts/ERC20.sol
index 14e0498..17dfdd1 100644
--- a/contracts/ERC20.sol
+++ b/contracts/ERC20.sol
@@ -305,12 +305,11 @@ abstract contract ERC20 {
             mstore(add(memptr, 0x40), r)
             mstore(add(memptr, 0x60), s)
 
-            if iszero(staticcall(not(0x00), 0x01, memptr, 0x80, memptr, 0x20)) {
+            if iszero(staticcall(_MAX, 0x01, memptr, 0x80, memptr, 0x20)) {
                 revert(0x00, 0x00)
             }
 
-            let size := returndatasize()
-            returndatacopy(memptr, 0, size)
+            returndatacopy(memptr, 0x00, returndatasize())
             let recovered := mload(memptr)
 
             // require(recovered != address(0) && recovered == owner, "Invalid Signature");
diff --git a/contracts/ERC20External.sol b/contracts/ERC20External.sol
index 69cd202..289fd28 100644
--- a/contracts/ERC20External.sol
+++ b/contracts/ERC20External.sol
@@ -390,12 +390,11 @@ abstract contract ERC20External {
             mstore(add(memptr, 0x40), r)
             mstore(add(memptr, 0x60), s)
 
-            if iszero(staticcall(not(0x00), 0x01, memptr, 0x80, memptr, 0x20)) {
+            if iszero(staticcall(_MAX, 0x01, memptr, 0x80, memptr, 0x20)) {
                 revert(0x00, 0x00)
             }
 
-            let size := returndatasize()
-            returndatacopy(memptr, 0, size)
+            returndatacopy(memptr, 0x00, returndatasize())
             let recovered := mload(memptr)
 
             // require(recovered != address(0) && recovered == owner, "Invalid Signature");
diff --git a/package.json b/package.json
index 5bc581c..4ececa6 100644
--- a/package.json
+++ b/package.json
@@ -74,5 +74,5 @@
   "homepage": "https://github.com/kassandraoftroy/yulerc20",
   "description": "Yul ERC20",
   "license": "MIT",
-  "version": "0.5.1"
+  "version": "0.5.2"
 }