diff --git a/doc/man/bitcoin-qt.1 b/doc/man/bitcoin-qt.1
index c1edae22b3..5aa2bb62d3 100644
--- a/doc/man/bitcoin-qt.1
+++ b/doc/man/bitcoin-qt.1
@@ -427,10 +427,6 @@ Relay and mine data carrier transactions (default: 1)
 .IP
 Maximum size of data in data carrier transactions we relay and mine
 (default: 83)
-.HP
-\fB\-mempoolreplacement\fR
-.IP
-Enable transaction replacement in the memory pool (default: 1)
 .PP
 Block creation options:
 .HP
diff --git a/doc/man/bitcoind.1 b/doc/man/bitcoind.1
index e8c68c18ed..68e05270ad 100644
--- a/doc/man/bitcoind.1
+++ b/doc/man/bitcoind.1
@@ -432,10 +432,6 @@ Relay and mine data carrier transactions (default: 1)
 .IP
 Maximum size of data in data carrier transactions we relay and mine
 (default: 83)
-.HP
-\fB\-mempoolreplacement\fR
-.IP
-Enable transaction replacement in the memory pool (default: 1)
 .PP
 Block creation options:
 .HP
diff --git a/src/init.cpp b/src/init.cpp
index f0021ca7a6..65b4bb7b04 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -483,7 +483,6 @@ std::string HelpMessage(HelpMessageMode mode)
     strUsage += HelpMessageOpt("-bytespersigop", strprintf(_("Equivalent bytes per sigop in transactions for relay and mining (default: %u)"), DEFAULT_BYTES_PER_SIGOP));
     strUsage += HelpMessageOpt("-datacarrier", strprintf(_("Relay and mine data carrier transactions (default: %u)"), DEFAULT_ACCEPT_DATACARRIER));
     strUsage += HelpMessageOpt("-datacarriersize", strprintf(_("Maximum size of data in data carrier transactions we relay and mine (default: %u)"), MAX_OP_RETURN_RELAY));
-    strUsage += HelpMessageOpt("-mempoolreplacement", strprintf(_("Enable transaction replacement in the memory pool (default: %u)"), DEFAULT_ENABLE_REPLACEMENT));
 
     strUsage += HelpMessageGroup(_("Block creation options:"));
     strUsage += HelpMessageOpt("-blockmaxweight=<n>", strprintf(_("Set maximum BIP141 block weight (default: %d)"), DEFAULT_BLOCK_MAX_WEIGHT));
@@ -1080,15 +1079,6 @@ bool AppInitParameterInteraction()
 
     nMaxTipAge = GetArg("-maxtipage", DEFAULT_MAX_TIP_AGE);
 
-    fEnableReplacement = GetBoolArg("-mempoolreplacement", DEFAULT_ENABLE_REPLACEMENT);
-    if ((!fEnableReplacement) && IsArgSet("-mempoolreplacement")) {
-        // Minimal effort at forwards compatibility
-        std::string strReplacementModeList = GetArg("-mempoolreplacement", "");  // default is impossible
-        std::vector<std::string> vstrReplacementModes;
-        boost::split(vstrReplacementModes, strReplacementModeList, boost::is_any_of(","));
-        fEnableReplacement = (std::find(vstrReplacementModes.begin(), vstrReplacementModes.end(), "fee") != vstrReplacementModes.end());
-    }
-
     try {
         InitGlobalAssetDir(mapMultiArgs.count("-assetdir") > 0 ? mapMultiArgs.at("-assetdir") : std::vector<std::string>());
     } catch (const std::exception& e) {
diff --git a/src/validation.cpp b/src/validation.cpp
index 49c9bc96f2..207517a720 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -80,7 +80,6 @@ bool fCheckpointsEnabled = DEFAULT_CHECKPOINTS_ENABLED;
 size_t nCoinCacheUsage = 5000 * 300;
 uint64_t nPruneTarget = 0;
 int64_t nMaxTipAge = DEFAULT_MAX_TIP_AGE;
-bool fEnableReplacement = DEFAULT_ENABLE_REPLACEMENT;
 
 uint256 hashAssumeValid;
 
@@ -1099,15 +1098,10 @@ bool AcceptToMemoryPoolWorker(CTxMemPool& pool, CValidationState& state, const C
                 // unconfirmed ancestors anyway; doing otherwise is hopelessly
                 // insecure.
                 bool fReplacementOptOut = true;
-                if (fEnableReplacement)
-                {
-                    BOOST_FOREACH(const CTxIn &_txin, ptxConflicting->vin)
-                    {
-                        if (_txin.nSequence < std::numeric_limits<unsigned int>::max()-1)
-                        {
-                            fReplacementOptOut = false;
-                            break;
-                        }
+                BOOST_FOREACH(const CTxIn &_txin, ptxConflicting->vin) {
+                    if (_txin.nSequence < std::numeric_limits<unsigned int>::max()-1) {
+                        fReplacementOptOut = false;
+                        break;
                     }
                 }
                 if (fReplacementOptOut)
diff --git a/src/validation.h b/src/validation.h
index 5a2a5777c8..7b40f4358c 100644
--- a/src/validation.h
+++ b/src/validation.h
@@ -134,8 +134,6 @@ static const bool DEFAULT_CHECKPOINTS_ENABLED = true;
 static const bool DEFAULT_TXINDEX = false;
 static const unsigned int DEFAULT_BANSCORE_THRESHOLD = 100;
 
-/** Default for -mempoolreplacement */
-static const bool DEFAULT_ENABLE_REPLACEMENT = true;
 /** Default for using fee filter */
 static const bool DEFAULT_FEEFILTER = true;
 
@@ -178,7 +176,6 @@ extern CFeeRate minRelayTxFee;
 extern CAmount maxTxFee;
 /** If the tip is older than this (in seconds), the node is considered to be in initial block download. */
 extern int64_t nMaxTipAge;
-extern bool fEnableReplacement;
 
 /** Block hash whose ancestors we will assume to have valid scripts without checking them. */
 extern uint256 hashAssumeValid;