diff --git a/src/test/undo_tests.cpp b/src/test/undo_tests.cpp
--- a/src/test/undo_tests.cpp
+++ b/src/test/undo_tests.cpp
@@ -19,7 +19,7 @@
                           CBlockUndo &blockundo,
                           const CChainParams &chainparams, uint32_t nHeight) {
     auto &coinbaseTx = *block.vtx[0];
-    UpdateCoins(view, coinbaseTx, nHeight);
+    AddCoins(view, coinbaseTx, nHeight);
 
     for (size_t i = 1; i < block.vtx.size(); i++) {
         auto &tx = *block.vtx[1];
diff --git a/src/txmempool.cpp b/src/txmempool.cpp
--- a/src/txmempool.cpp
+++ b/src/txmempool.cpp
@@ -8,6 +8,7 @@
 #include <chain.h>
 #include <chainparams.h> // for GetConsensus.
 #include <clientversion.h>
+#include <coins.h>
 #include <config.h>
 #include <consensus/consensus.h>
 #include <consensus/tx_verify.h>
@@ -870,7 +871,10 @@
             Consensus::CheckTxInputs(tx, dummy_state, mempoolDuplicate,
                                      spendheight, txfee);
         assert(fCheckResult);
-        UpdateCoins(mempoolDuplicate, tx, std::numeric_limits<int>::max());
+        for (const auto &input : tx.vin) {
+            mempoolDuplicate.SpendCoin(input.prevout);
+        }
+        AddCoins(mempoolDuplicate, tx, std::numeric_limits<int>::max());
     }
 
     for (auto it = mapNextTx.cbegin(); it != mapNextTx.cend(); it++) {
diff --git a/src/validation.h b/src/validation.h
--- a/src/validation.h
+++ b/src/validation.h
@@ -465,7 +465,6 @@
 /**
  * Apply the effects of this transaction on the UTXO set represented by view.
  */
-void UpdateCoins(CCoinsViewCache &view, const CTransaction &tx, int nHeight);
 void UpdateCoins(CCoinsViewCache &view, const CTransaction &tx, CTxUndo &txundo,
                  int nHeight);
 
diff --git a/src/validation.cpp b/src/validation.cpp
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -1145,19 +1145,6 @@
     AddCoins(view, tx, nHeight);
 }
 
-void UpdateCoins(CCoinsViewCache &view, const CTransaction &tx, int nHeight) {
-    // Mark inputs spent.
-    if (!tx.IsCoinBase()) {
-        for (const CTxIn &txin : tx.vin) {
-            bool is_spent = view.SpendCoin(txin.prevout);
-            assert(is_spent);
-        }
-    }
-
-    // Add outputs.
-    AddCoins(view, tx, nHeight);
-}
-
 bool CScriptCheck::operator()() {
     const CScript &scriptSig = ptxTo->vin[nIn].scriptSig;
     if (!VerifyScript(scriptSig, m_tx_out.scriptPubKey, nFlags,