diff --git a/src/chainparams.cpp b/src/chainparams.cpp
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -121,9 +121,6 @@
         // November 15, 2018 hard fork
         consensus.magneticAnomalyHeight = 556766;
 
-        // Wed, 15 May 2019 12:00:00 UTC hard fork
-        consensus.greatWallActivationTime = 1557921600;
-
         // Nov 15, 2019 12:00:00 UTC protocol upgrade
         consensus.gravitonActivationTime = 1573819200;
 
@@ -289,9 +286,6 @@
         // November 15, 2018 hard fork
         consensus.magneticAnomalyHeight = 1267996;
 
-        // Wed, 15 May 2019 12:00:00 UTC hard fork
-        consensus.greatWallActivationTime = 1557921600;
-
         // Nov 15, 2019 12:00:00 UTC protocol upgrade
         consensus.gravitonActivationTime = 1573819200;
 
@@ -409,9 +403,6 @@
         // November 15, 2018 hard fork is always on on regtest.
         consensus.magneticAnomalyHeight = 0;
 
-        // Wed, 15 May 2019 12:00:00 UTC hard fork
-        consensus.greatWallActivationTime = 1557921600;
-
         // Nov 15, 2019 12:00:00 UTC protocol upgrade
         consensus.gravitonActivationTime = 1573819200;
 
diff --git a/src/consensus/activation.h b/src/consensus/activation.h
--- a/src/consensus/activation.h
+++ b/src/consensus/activation.h
@@ -22,9 +22,6 @@
 bool IsMagneticAnomalyEnabled(const Config &config,
                               const CBlockIndex *pindexPrev);
 
-/** Check if May 15th, 2019 protocol upgrade has activated. */
-bool IsGreatWallEnabled(const Config &config, const CBlockIndex *pindexPrev);
-
 /** Check if Nov 15th, 2019 protocol upgrade has activated. */
 bool IsGravitonEnabled(const Config &config, const CBlockIndex *pindexPrev);
 
diff --git a/src/consensus/activation.cpp b/src/consensus/activation.cpp
--- a/src/consensus/activation.cpp
+++ b/src/consensus/activation.cpp
@@ -47,17 +47,6 @@
     return IsMagneticAnomalyEnabled(config, pindexPrev->nHeight);
 }
 
-bool IsGreatWallEnabled(const Config &config, const CBlockIndex *pindexPrev) {
-    if (pindexPrev == nullptr) {
-        return false;
-    }
-
-    return pindexPrev->GetMedianTimePast() >=
-           gArgs.GetArg(
-               "-greatwallactivationtime",
-               config.GetChainParams().GetConsensus().greatWallActivationTime);
-}
-
 bool IsGravitonEnabled(const Config &config, const CBlockIndex *pindexPrev) {
     if (pindexPrev == nullptr) {
         return false;
diff --git a/src/consensus/params.h b/src/consensus/params.h
--- a/src/consensus/params.h
+++ b/src/consensus/params.h
@@ -36,8 +36,6 @@
     int daaHeight;
     /** Block height at which the magnetic anomaly activation becomes active */
     int magneticAnomalyHeight;
-    /** Unix time used for MTP activation of 15 May 2019 12:00:00 UTC upgrade */
-    int greatWallActivationTime;
     /** Unix time used for MTP activation of Nov 15 2019 12:00:00 UTC upgrade */
     int gravitonActivationTime;
     /** Proof of work parameters */
diff --git a/src/test/activation_tests.cpp b/src/test/activation_tests.cpp
--- a/src/test/activation_tests.cpp
+++ b/src/test/activation_tests.cpp
@@ -23,30 +23,6 @@
     assert(blocks.back().GetMedianTimePast() == mtp);
 }
 
-BOOST_AUTO_TEST_CASE(isgreatwallenabled) {
-    DummyConfig config;
-    CBlockIndex prev;
-
-    const auto activation =
-        config.GetChainParams().GetConsensus().greatWallActivationTime;
-
-    BOOST_CHECK(!IsGreatWallEnabled(config, nullptr));
-
-    std::array<CBlockIndex, 12> blocks;
-    for (size_t i = 1; i < blocks.size(); ++i) {
-        blocks[i].pprev = &blocks[i - 1];
-    }
-
-    SetMTP(blocks, activation - 1);
-    BOOST_CHECK(!IsGreatWallEnabled(config, &blocks.back()));
-
-    SetMTP(blocks, activation);
-    BOOST_CHECK(IsGreatWallEnabled(config, &blocks.back()));
-
-    SetMTP(blocks, activation + 1);
-    BOOST_CHECK(IsGreatWallEnabled(config, &blocks.back()));
-}
-
 BOOST_AUTO_TEST_CASE(isgravitonenabled) {
     DummyConfig config;
     CBlockIndex prev;
diff --git a/src/validation.cpp b/src/validation.cpp
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -389,11 +389,6 @@
     return IsMagneticAnomalyEnabled(config, chainActive.Tip());
 }
 
-static bool IsGreatWallEnabledForCurrentBlock(const Config &config) {
-    AssertLockHeld(cs_main);
-    return IsGreatWallEnabled(config, chainActive.Tip());
-}
-
 // Command-line argument "-replayprotectionactivationtime=<timestamp>" will
 // cause the node to switch to replay protected SigHash ForkID value when the
 // median timestamp of the previous 11 blocks is greater than or equal to
diff --git a/test/lint/check-doc.py b/test/lint/check-doc.py
--- a/test/lint/check-doc.py
+++ b/test/lint/check-doc.py
@@ -32,8 +32,6 @@
                         '-forcecompactdb',
                         # TODO remove after the Nov 2019 upgrade
                         '-gravitonactivationtime',
-                        # TODO remove after the may 2019 fork
-                        '-greatwallactivationtime',
                         '-h',
                         '-help',
                         '-parkdeepreorg',