diff --git a/contracts/handler/extensible/SignatureVerifierMuxer.sol b/contracts/handler/extensible/SignatureVerifierMuxer.sol
index c552acade..594f0a5fc 100644
--- a/contracts/handler/extensible/SignatureVerifierMuxer.sol
+++ b/contracts/handler/extensible/SignatureVerifierMuxer.sol
@@ -110,7 +110,7 @@ abstract contract SignatureVerifierMuxer is ExtensibleBase, ERC1271, ISignatureV
             /* solhint-disable no-inline-assembly */
             /// @solidity memory-safe-assembly
             assembly {
-                sigSelector := and(calldataload(signature.offset), 0xFFFFFFFF00000000000000000000000000000000000000000000000000000000)
+                sigSelector := calldataload(signature.offset)
             }
             /* solhint-enable no-inline-assembly */