diff --git a/src/chainparamsbase.h b/src/chainparamsbase.h
--- a/src/chainparamsbase.h
+++ b/src/chainparamsbase.h
@@ -23,20 +23,20 @@
     static const std::string REGTEST;
 
     const std::string &DataDir() const { return strDataDir; }
-    int RPCPort() const { return nRPCPort; }
+    uint16_t RPCPort() const { return m_rpc_port; }
     uint16_t OnionServiceTargetPort() const {
         return m_onion_service_target_port;
     }
 
     CBaseChainParams() = delete;
-    CBaseChainParams(const std::string &data_dir, int rpc_port,
+    CBaseChainParams(const std::string &data_dir, uint16_t rpc_port,
                      uint16_t onion_service_target_port)
-        : nRPCPort(rpc_port),
+        : m_rpc_port(rpc_port),
           m_onion_service_target_port(onion_service_target_port),
           strDataDir(data_dir) {}
 
 private:
-    int nRPCPort;
+    const uint16_t m_rpc_port;
     const uint16_t m_onion_service_target_port;
     std::string strDataDir;
 };