diff --git a/src/consensus/params.h b/src/consensus/params.h
index 72d4d6729..bc3d7c75d 100644
--- a/src/consensus/params.h
+++ b/src/consensus/params.h
@@ -67,6 +67,7 @@ struct Params {
     int64_t nProtocolV1RetargetingFixedTime;
     int64_t nProtocolV2Time;
     int64_t nProtocolV3Time;
+    bool IsProtocolV1RetargetingFixed(int64_t nTime) const { return nTime > nProtocolV1RetargetingFixedTime && nTime != 1395631999; }
     bool IsProtocolV2(int64_t nTime) const { return nTime > nProtocolV2Time && nTime != 1407053678; }
     bool IsProtocolV3(int64_t nTime) const { return nTime > nProtocolV3Time && nTime != 1444028400; }
     unsigned int GetTargetSpacing(int nHeight) { return IsProtocolV2(nHeight) ? 64 : 60; }
diff --git a/src/main.cpp b/src/main.cpp
index 6e9a6d502..dd902529d 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -2340,7 +2340,7 @@ bool ConnectBlock(const CBlock& block, CValidationState& state, CBlockIndex* pin
     pindex->nStakeModifier = ComputeStakeModifier(pindex->pprev, block.IsProofOfStake() ? block.vtx[1].vin[0].prevout.hash : block.GetHash());
 
     // Check proof-of-stake
-    if (block.IsProofOfStake() && block.GetBlockTime() > chainparams.GetConsensus().nProtocolV3Time) {
+    if (block.IsProofOfStake() && chainparams.GetConsensus().IsProtocolV3(block.GetBlockTime())) {
          const COutPoint &prevout = block.vtx[1].vin[0].prevout;
          const CCoins *coins = view.AccessCoins(prevout.hash);
           if (!coins)
@@ -2416,7 +2416,7 @@ bool ConnectBlock(const CBlock& block, CValidationState& state, CBlockIndex* pin
     flags |= SCRIPT_VERIFY_LOW_S;
 
     // Start enforcing CHECKLOCKTIMEVERIFY, (BIP65) since protocol v3
-    if (block.GetBlockTime() > chainparams.GetConsensus().nProtocolV3Time) {
+    if (chainparams.GetConsensus().IsProtocolV3(block.GetBlockTime())) {
         flags |= SCRIPT_VERIFY_CHECKLOCKTIMEVERIFY;
         flags |= SCRIPT_VERIFY_NULLDUMMY;
     }
@@ -2518,7 +2518,7 @@ bool ConnectBlock(const CBlock& block, CValidationState& state, CBlockIndex* pin
                                        REJECT_INVALID, "bad-cb-amount");
     }
 
-    if (block.IsProofOfStake() && block.GetBlockTime() > chainparams.GetConsensus().nProtocolV3Time) {
+    if (block.IsProofOfStake() && chainparams.GetConsensus().IsProtocolV3(block.GetBlockTime())) {
             CAmount blockReward = nFees + GetProofOfStakeSubsidy();
             if (nActualStakeReward > blockReward)
                 return state.DoS(100,
diff --git a/src/pow.cpp b/src/pow.cpp
index ca2f8b1b0..ab0d7041d 100644
--- a/src/pow.cpp
+++ b/src/pow.cpp
@@ -61,9 +61,9 @@ unsigned int CalculateNextTargetRequired(const CBlockIndex* pindexLast, int64_t
     int64_t nActualSpacing = pindexLast->GetBlockTime() - nFirstBlockTime;
 
     // Limit adjustment step
-    if (pindexLast->GetBlockTime() > params.nProtocolV1RetargetingFixedTime && nActualSpacing < 0)
+    if (params.IsProtocolV1RetargetingFixed(pindexLast->GetBlockTime()) && nActualSpacing < 0)
         nActualSpacing = nTargetSpacing;
-    if (pindexLast->GetBlockTime() > params.nProtocolV3Time && nActualSpacing > nTargetSpacing*10)
+    if (params.IsProtocolV3(pindexLast->GetBlockTime()) && nActualSpacing > nTargetSpacing*10)
         nActualSpacing = nTargetSpacing*10;
 
     // retarget with exponential moving toward target spacing