diff --git a/src/txdb.h b/src/txdb.h
index 293ceb850..220cfb171 100644
--- a/src/txdb.h
+++ b/src/txdb.h
@@ -35,7 +35,7 @@ public:
     CCoinsViewDB(size_t nCacheSize, bool fMemory = false, bool fWipe = false);
 
     bool GetAnchorAt(const uint256 &rt, ZCIncrementalMerkleTree &tree) const;
-    bool GetNullifier(const uint256 &serial) const;
+    bool GetNullifier(const uint256 &nf) const;
     bool GetCoins(const uint256 &txid, CCoins &coins) const;
     bool HaveCoins(const uint256 &txid) const;
     uint256 GetBestBlock() const;