diff --git a/src/addrdb.h b/src/addrdb.h
--- a/src/addrdb.h
+++ b/src/addrdb.h
@@ -6,9 +6,9 @@
 #ifndef BITCOIN_ADDRDB_H
 #define BITCOIN_ADDRDB_H
 
+#include "chainparams.h"
 #include "fs.h"
 #include "serialize.h"
-
 #include <map>
 #include <string>
 
@@ -72,9 +72,10 @@
 class CAddrDB {
 private:
     fs::path pathAddr;
+    const CChainParams &chainParams;
 
 public:
-    CAddrDB();
+    CAddrDB(const CChainParams &chainParams);
     bool Write(const CAddrMan &addr);
     bool Read(CAddrMan &addr);
     bool Read(CAddrMan &addr, CDataStream &ssPeers);
@@ -84,9 +85,10 @@
 class CBanDB {
 private:
     fs::path pathBanlist;
+    const CChainParams &chainParams;
 
 public:
-    CBanDB();
+    CBanDB(const CChainParams &chainParams);
     bool Write(const banmap_t &banSet);
     bool Read(banmap_t &banSet);
 };
diff --git a/src/addrdb.cpp b/src/addrdb.cpp
--- a/src/addrdb.cpp
+++ b/src/addrdb.cpp
@@ -15,7 +15,7 @@
 #include "tinyformat.h"
 #include "util.h"
 
-CBanDB::CBanDB() {
+CBanDB::CBanDB(const CChainParams &chainParams) : chainParams(chainParams) {
     pathBanlist = GetDataDir() / "banlist.dat";
 }
 
@@ -27,7 +27,7 @@
 
     // serialize banlist, checksum data up to that point, then append csum
     CDataStream ssBanlist(SER_DISK, CLIENT_VERSION);
-    ssBanlist << FLATDATA(Params().DiskMagic());
+    ssBanlist << FLATDATA(chainParams.DiskMagic());
     ssBanlist << banSet;
     uint256 hash = Hash(ssBanlist.begin(), ssBanlist.end());
     ssBanlist << hash;
@@ -94,7 +94,7 @@
         ssBanlist >> FLATDATA(pchMsgTmp);
 
         // ... verify the network matches ours
-        if (memcmp(pchMsgTmp, std::begin(Params().DiskMagic()),
+        if (memcmp(pchMsgTmp, std::begin(chainParams.DiskMagic()),
                    sizeof(pchMsgTmp))) {
             return error("%s: Invalid network magic number", __func__);
         }
@@ -108,7 +108,7 @@
     return true;
 }
 
-CAddrDB::CAddrDB() {
+CAddrDB::CAddrDB(const CChainParams &chainParams) : chainParams(chainParams) {
     pathAddr = GetDataDir() / "peers.dat";
 }
 
@@ -120,7 +120,7 @@
 
     // serialize addresses, checksum data up to that point, then append csum
     CDataStream ssPeers(SER_DISK, CLIENT_VERSION);
-    ssPeers << FLATDATA(Params().DiskMagic());
+    ssPeers << FLATDATA(chainParams.DiskMagic());
     ssPeers << addr;
     uint256 hash = Hash(ssPeers.begin(), ssPeers.end());
     ssPeers << hash;
@@ -190,7 +190,7 @@
         ssPeers >> FLATDATA(pchMsgTmp);
 
         // ... verify the network matches ours
-        if (memcmp(pchMsgTmp, std::begin(Params().DiskMagic()),
+        if (memcmp(pchMsgTmp, std::begin(chainParams.DiskMagic()),
                    sizeof(pchMsgTmp))) {
             return error("%s: Invalid network magic number", __func__);
         }
diff --git a/src/net.cpp b/src/net.cpp
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -415,7 +415,7 @@
 
     int64_t nStart = GetTimeMillis();
 
-    CBanDB bandb;
+    CBanDB bandb(config->GetChainParams());
     banmap_t banmap;
     GetBanned(banmap);
     if (bandb.Write(banmap)) {
@@ -1715,7 +1715,7 @@
 void CConnman::DumpAddresses() {
     int64_t nStart = GetTimeMillis();
 
-    CAddrDB adb;
+    CAddrDB adb(config->GetChainParams());
     adb.Write(addrman);
 
     LogPrint(BCLog::NET, "Flushed %d addresses to peers.dat  %dms\n",
@@ -2370,7 +2370,7 @@
     // Load addresses from peers.dat
     int64_t nStart = GetTimeMillis();
     {
-        CAddrDB adb;
+        CAddrDB adb(config->GetChainParams());
         if (adb.Read(addrman)) {
             LogPrintf("Loaded %i addresses from peers.dat  %dms\n",
                       addrman.size(), GetTimeMillis() - nStart);
@@ -2386,7 +2386,7 @@
     }
     // Load addresses from banlist.dat
     nStart = GetTimeMillis();
-    CBanDB bandb;
+    CBanDB bandb(config->GetChainParams());
     banmap_t banmap;
     if (bandb.Read(banmap)) {
         // thread save setter
diff --git a/src/test/net_tests.cpp b/src/test/net_tests.cpp
--- a/src/test/net_tests.cpp
+++ b/src/test/net_tests.cpp
@@ -105,7 +105,7 @@
     CDataStream ssPeers2 = AddrmanToStream(addrmanUncorrupted);
 
     CAddrMan addrman2;
-    CAddrDB adb;
+    CAddrDB adb(Params());
     BOOST_CHECK(addrman2.size() == 0);
     adb.Read(addrman2, ssPeers2);
     BOOST_CHECK(addrman2.size() == 3);
@@ -137,7 +137,7 @@
     CDataStream ssPeers2 = AddrmanToStream(addrmanCorrupted);
 
     CAddrMan addrman2;
-    CAddrDB adb;
+    CAddrDB adb(Params());
     BOOST_CHECK(addrman2.size() == 0);
     adb.Read(addrman2, ssPeers2);
     BOOST_CHECK(addrman2.size() == 0);