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();