diff --git a/src/script/interpreter.h b/src/script/interpreter.h
--- a/src/script/interpreter.h
+++ b/src/script/interpreter.h
@@ -33,7 +33,7 @@
                                  const CPubKey &vchPubKey,
                                  const uint256 &sighash) const;
 
-    virtual bool CheckSig(const std::vector<uint8_t> &scriptSig,
+    virtual bool CheckSig(const std::vector<uint8_t> &vchSigIn,
                           const std::vector<uint8_t> &vchPubKey,
                           const CScript &scriptCode, uint32_t flags) const {
         return false;
@@ -67,7 +67,7 @@
         : txTo(txToIn), nIn(nInIn), amount(amountIn), txdata(&txdataIn) {}
 
     // The overriden functions are now final.
-    bool CheckSig(const std::vector<uint8_t> &scriptSig,
+    bool CheckSig(const std::vector<uint8_t> &vchSigIn,
                   const std::vector<uint8_t> &vchPubKey,
                   const CScript &scriptCode,
                   uint32_t flags) const final override;