diff --git a/src/kernel/chainparams.cpp b/src/kernel/chainparams.cpp
index 6cee379faf9..7e69c097a6a 100644
--- a/src/kernel/chainparams.cpp
+++ b/src/kernel/chainparams.cpp
@@ -152,7 +152,6 @@ class CMainParams : public CChainParams {
         vFixedSeeds = std::vector<uint8_t>(std::begin(chainparams_seed_main), std::end(chainparams_seed_main));
 
         fDefaultConsistencyChecks = false;
-        m_is_test_chain = false;
         m_is_mockable_chain = false;
 
         checkpointData = {
@@ -259,7 +258,6 @@ class CTestNetParams : public CChainParams {
         vFixedSeeds = std::vector<uint8_t>(std::begin(chainparams_seed_test), std::end(chainparams_seed_test));
 
         fDefaultConsistencyChecks = false;
-        m_is_test_chain = true;
         m_is_mockable_chain = false;
 
         checkpointData = {
@@ -381,7 +379,6 @@ class SigNetParams : public CChainParams {
         bech32_hrp = "tb";
 
         fDefaultConsistencyChecks = false;
-        m_is_test_chain = true;
         m_is_mockable_chain = false;
     }
 };
@@ -472,7 +469,6 @@ class CRegTestParams : public CChainParams
         vSeeds.emplace_back("dummySeed.invalid.");
 
         fDefaultConsistencyChecks = true;
-        m_is_test_chain = true;
         m_is_mockable_chain = true;
 
         checkpointData = {
diff --git a/src/kernel/chainparams.h b/src/kernel/chainparams.h
index 63837bb23ed..ec1697493c9 100644
--- a/src/kernel/chainparams.h
+++ b/src/kernel/chainparams.h
@@ -93,7 +93,7 @@ class CChainParams
     /** Default value for -checkmempool and -checkblockindex argument */
     bool DefaultConsistencyChecks() const { return fDefaultConsistencyChecks; }
     /** If this chain is exclusively used for testing */
-    bool IsTestChain() const { return m_is_test_chain; }
+    bool IsTestChain() const { return m_chain_type != ChainType::MAIN; }
     /** If this chain allows time to be mocked */
     bool IsMockableChain() const { return m_is_mockable_chain; }
     uint64_t PruneAfterHeight() const { return nPruneAfterHeight; }
@@ -167,7 +167,6 @@ class CChainParams
     CBlock genesis;
     std::vector<uint8_t> vFixedSeeds;
     bool fDefaultConsistencyChecks;
-    bool m_is_test_chain;
     bool m_is_mockable_chain;
     CCheckpointData checkpointData;
     MapAssumeutxo m_assumeutxo_data;
diff --git a/src/rpc/mempool.cpp b/src/rpc/mempool.cpp
index 377e9de0e84..705608bd476 100644
--- a/src/rpc/mempool.cpp
+++ b/src/rpc/mempool.cpp
@@ -862,7 +862,7 @@ static RPCHelpMan submitpackage()
         },
         [&](const RPCHelpMan& self, const JSONRPCRequest& request) -> UniValue
         {
-            if (!Params().IsMockableChain()) {
+            if (Params().GetChainType() != ChainType::REGTEST) {
                 throw std::runtime_error("submitpackage is for regression testing (-regtest mode) only");
             }
             const UniValue raw_transactions = request.params[0].get_array();