diff --git a/src/seeder/main.cpp b/src/seeder/main.cpp
--- a/src/seeder/main.cpp
+++ b/src/seeder/main.cpp
@@ -18,6 +18,19 @@
 
 const std::function<std::string(const char *)> G_TRANSLATION_FUN = nullptr;
 
+const int nThreads_default = 96;
+const int nPort_default = 53;
+const int nDnsThreads_default = 4;
+const bool fUseTestNet_default = false;
+const bool fWipeBan_default = false;
+const bool fWipeIgnore_default = false;
+const char *mbox_default = nullptr;
+const char *ns_default = nullptr;
+const char *host_default = nullptr;
+const char *tor_default = nullptr;
+const char *ipv4_proxy_default = nullptr;
+const char *ipv6_proxy_default = nullptr;
+
 class CDnsSeedOpts {
 public:
     int nThreads;
@@ -35,10 +48,12 @@
     std::set<uint64_t> filter_whitelist;
 
     CDnsSeedOpts()
-        : nThreads(96), nPort(53), nDnsThreads(4), fUseTestNet(false),
-          fWipeBan(false), fWipeIgnore(false), mbox(nullptr), ns(nullptr),
-          host(nullptr), tor(nullptr), ipv4_proxy(nullptr),
-          ipv6_proxy(nullptr) {}
+        : nThreads(nThreads_default), nPort(nPort_default),
+          nDnsThreads(nDnsThreads_default), fUseTestNet(fUseTestNet_default),
+          fWipeBan(fWipeBan_default), fWipeIgnore(fWipeIgnore_default),
+          mbox(mbox_default), ns(ns_default), host(host_default),
+          tor(tor_default), ipv4_proxy(ipv4_proxy_default),
+          ipv6_proxy(ipv6_proxy_default) {}
 
     void ParseCommandLine(int argc, char **argv) {
         static const char *help =