diff --git a/src/test/checkpoints_tests.cpp b/src/test/checkpoints_tests.cpp
--- a/src/test/checkpoints_tests.cpp
+++ b/src/test/checkpoints_tests.cpp
@@ -10,12 +10,16 @@
 #include "checkpoints.h"
 
 #include "chainparams.h"
+#include "config.h"
+#include "consensus/validation.h"
+#include "miner.h"
 #include "test/test_bitcoin.h"
 #include "uint256.h"
+#include "validation.h"
 
 #include <boost/test/unit_test.hpp>
 
-BOOST_FIXTURE_TEST_SUITE(checkpoints_tests, BasicTestingSetup)
+BOOST_FIXTURE_TEST_SUITE(checkpoints_tests, TestChain100Setup)
 
 BOOST_AUTO_TEST_CASE(sanity) {
     const auto params = CreateChainParams(CBaseChainParams::MAIN);
@@ -36,4 +40,40 @@
     BOOST_CHECK(Checkpoints::CheckBlock(checkpoints, 134444 + 1, p11111));
 }
 
+BOOST_AUTO_TEST_CASE(ban_fork_prior_to_checkpoint) {
+    DummyConfig config;
+
+    // Sanity check that a checkpoint exists at the genesis block
+    auto checkpoints = config.GetChainParams().Checkpoints().mapCheckpoints;
+    assert(checkpoints.find(0) != checkpoints.end());
+
+    // Another precomputed genesis block (height 0) should conflict with the
+    // regnet genesis block checkpoint, but not be accepted or stored in memory
+    CBlockHeader header;
+    CDataStream stream(SER_NETWORK, PROTOCOL_VERSION);
+    stream << ParseHex(
+        "0100000000000000000000000000000000000000000000000000000000000000000000"
+        "003ba3edfd7a7b12b27ac72c3e67768f617fc81bc3888a51323a9fb8aa4b1e5e4adbe5"
+        "494dffff7f200200000001010000000100000000000000000000000000000000000000"
+        "00000000000000000000000000ffffffff4d04ffff001d0104455468652054696d6573"
+        "2030332f4a616e2f32303039204368616e63656c6c6f72206f6e206272696e6b206f66"
+        "207365636f6e64206261696c6f757420666f722062616e6b73ffffffff0100f2052a01"
+        "000000434104678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f"
+        "61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f"
+        "ac00000000");
+    stream >> header;
+
+    // Header should not be accepted
+    CValidationState state;
+    CBlockHeader invalid;
+    const CBlockIndex *pindex = nullptr;
+    BOOST_CHECK(
+        !ProcessNewBlockHeaders(config, {header}, state, &pindex, &invalid));
+    BOOST_CHECK(pindex == nullptr);
+    BOOST_CHECK(invalid.GetHash() == header.GetHash());
+
+    // Sanity check to ensure header was not saved in memory
+    BOOST_CHECK(mapBlockIndex.find(header.GetHash()) == mapBlockIndex.end());
+}
+
 BOOST_AUTO_TEST_SUITE_END()