diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index 623104690..9c843f6e7 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -12,8 +12,6 @@
 
 #include <boost/assign/list_of.hpp>
 
-using namespace std;
-
 #include "chainparamsseeds.h"
 
 static CBlock CreateGenesisBlock(const char* pszTimestamp, const CScript& genesisOutputScript, uint32_t nTime, uint32_t nNonce, uint32_t nBits, int32_t nVersion, const CAmount& genesisReward)
@@ -22,7 +20,7 @@ static CBlock CreateGenesisBlock(const char* pszTimestamp, const CScript& genesi
     txNew.nVersion = 1;
     txNew.vin.resize(1);
     txNew.vout.resize(1);
-    txNew.vin[0].scriptSig = CScript() << 486604799 << CScriptNum(4) << vector<unsigned char>((const unsigned char*)pszTimestamp, (const unsigned char*)pszTimestamp + strlen(pszTimestamp));
+    txNew.vin[0].scriptSig = CScript() << 486604799 << CScriptNum(4) << std::vector<unsigned char>((const unsigned char*)pszTimestamp, (const unsigned char*)pszTimestamp + strlen(pszTimestamp));
     txNew.vout[0].nValue = genesisReward;
     txNew.vout[0].scriptPubKey = genesisOutputScript;
 
@@ -117,7 +115,7 @@ public:
         fMineBlocksOnDemand = false;
         fTestnetToBeDeprecatedFieldRPC = false;
 
-        checkpointData = (Checkpoints::CCheckpointData) {
+        checkpointData = (CCheckpointData) {
             boost::assign::map_list_of
             ( 11111, uint256S("0x0000000069e244f73d78e8fd29ba2fd2ed618bd6fa2ee92559f542fdb26e7c1d"))
             ( 33333, uint256S("0x000000002dd5588a74784eaa7ab0507a18ad16a236e7b1ce69f00d7ddfb5d0a6"))
@@ -190,7 +188,7 @@ public:
         fMineBlocksOnDemand = false;
         fTestnetToBeDeprecatedFieldRPC = true;
 
-        checkpointData = (Checkpoints::CCheckpointData) {
+        checkpointData = (CCheckpointData) {
             boost::assign::map_list_of
             ( 546, uint256S("000000002a936ca763904c3c35fce2f3556c559c0214345d31b1bcebf76acb70")),
             1337966069,
@@ -239,7 +237,7 @@ public:
         fMineBlocksOnDemand = true;
         fTestnetToBeDeprecatedFieldRPC = false;
 
-        checkpointData = (Checkpoints::CCheckpointData){
+        checkpointData = (CCheckpointData){
             boost::assign::map_list_of
             ( 0, uint256S("0f9188f13cb7b2c71f2a335e3a4fc328bf5beb436012afca590b1a11466e2206")),
             0,
diff --git a/src/chainparams.h b/src/chainparams.h
index 66d865b62..5db39aa09 100644
--- a/src/chainparams.h
+++ b/src/chainparams.h
@@ -7,7 +7,6 @@
 #define BITCOIN_CHAINPARAMS_H
 
 #include "chainparamsbase.h"
-#include "checkpoints.h"
 #include "consensus/params.h"
 #include "primitives/block.h"
 #include "protocol.h"
@@ -24,6 +23,14 @@ struct SeedSpec6 {
     uint16_t port;
 };
 
+typedef std::map<int, uint256> MapCheckpoints;
+
+struct CCheckpointData {
+    MapCheckpoints mapCheckpoints;
+    int64_t nTimeLastCheckpoint;
+    int64_t nTransactionsLastCheckpoint;
+    double fTransactionsPerDay;
+};
 
 /**
  * CChainParams defines various tweakable parameters of a given instance of the
@@ -67,7 +74,7 @@ public:
     const std::vector<CDNSSeedData>& DNSSeeds() const { return vSeeds; }
     const std::vector<unsigned char>& Base58Prefix(Base58Type type) const { return base58Prefixes[type]; }
     const std::vector<SeedSpec6>& FixedSeeds() const { return vFixedSeeds; }
-    const Checkpoints::CCheckpointData& Checkpoints() const { return checkpointData; }
+    const CCheckpointData& Checkpoints() const { return checkpointData; }
 protected:
     CChainParams() {}
 
@@ -87,7 +94,7 @@ protected:
     bool fRequireStandard;
     bool fMineBlocksOnDemand;
     bool fTestnetToBeDeprecatedFieldRPC;
-    Checkpoints::CCheckpointData checkpointData;
+    CCheckpointData checkpointData;
 };
 
 /**
diff --git a/src/checkpoints.h b/src/checkpoints.h
index 001e3cc80..5fce6fa81 100644
--- a/src/checkpoints.h
+++ b/src/checkpoints.h
@@ -10,6 +10,7 @@
 #include <map>
 
 class CBlockIndex;
+struct CCheckpointData;
 
 /**
  * Block-chain checkpoints are compiled-in sanity checks.
@@ -17,14 +18,6 @@ class CBlockIndex;
  */
 namespace Checkpoints
 {
-typedef std::map<int, uint256> MapCheckpoints;
-
-struct CCheckpointData {
-    MapCheckpoints mapCheckpoints;
-    int64_t nTimeLastCheckpoint;
-    int64_t nTransactionsLastCheckpoint;
-    double fTransactionsPerDay;
-};
 
 //! Return conservative estimate of total number of blocks, 0 if unknown
 int GetTotalBlocksEstimate(const CCheckpointData& data);
diff --git a/src/test/Checkpoints_tests.cpp b/src/test/Checkpoints_tests.cpp
index 703cf307d..0a23c430e 100644
--- a/src/test/Checkpoints_tests.cpp
+++ b/src/test/Checkpoints_tests.cpp
@@ -20,7 +20,7 @@ BOOST_FIXTURE_TEST_SUITE(Checkpoints_tests, BasicTestingSetup)
 
 BOOST_AUTO_TEST_CASE(sanity)
 {
-    const Checkpoints::CCheckpointData& checkpoints = Params(CBaseChainParams::MAIN).Checkpoints();
+    const CCheckpointData& checkpoints = Params(CBaseChainParams::MAIN).Checkpoints();
     BOOST_CHECK(Checkpoints::GetTotalBlocksEstimate(checkpoints) >= 134444);
 }