diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index a86c68ebb..b0309b76a 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -135,6 +135,7 @@ public:
         consensus.nExtendedClaimExpirationTime = 2102400;
         consensus.nExtendedClaimExpirationForkHeight = 400155;
         consensus.fPowAllowMinDifficultyBlocks = false;
+        consensus.nAllowMinDiffMinHeight = consensus.nAllowMinDiffMaxHeight = -1;
         consensus.fPowNoRetargeting = false;
         consensus.nNormalizedNameForkHeight = 539940; // targeting 21 March 2019
         consensus.nRuleChangeActivationThreshold = 1916; // 95% of 2016
@@ -223,6 +224,8 @@ public:
         consensus.nExtendedClaimExpirationTime = 2102400;
         consensus.nExtendedClaimExpirationForkHeight = 278160;
         consensus.fPowAllowMinDifficultyBlocks = true;
+        consensus.nAllowMinDiffMinHeight = 277299;
+        consensus.nAllowMinDiffMaxHeight = 1100000;
         consensus.fPowNoRetargeting = false;
         consensus.nNormalizedNameForkHeight = 993380;   // targeting, 21 Feb 2019
         consensus.nRuleChangeActivationThreshold = 1512; // 75% for testchains
@@ -304,6 +307,7 @@ public:
         consensus.nExtendedClaimExpirationTime = 600;
         consensus.nExtendedClaimExpirationForkHeight = 800;
         consensus.fPowAllowMinDifficultyBlocks = false;
+        consensus.nAllowMinDiffMinHeight = consensus.nAllowMinDiffMaxHeight = -1;
         consensus.fPowNoRetargeting = false;
         consensus.nNormalizedNameForkHeight = 250; // SDK depends upon this number
         consensus.nRuleChangeActivationThreshold = 108; // 75% for testchains
diff --git a/src/consensus/params.h b/src/consensus/params.h
index 913121cb3..414f0a852 100644
--- a/src/consensus/params.h
+++ b/src/consensus/params.h
@@ -55,6 +55,8 @@ struct Params {
     /** Proof of work parameters */
     uint256 powLimit;
     bool fPowAllowMinDifficultyBlocks;
+    int nAllowMinDiffMinHeight;
+    int nAllowMinDiffMaxHeight;
     bool fPowNoRetargeting;
     int nNormalizedNameForkHeight;
     int64_t nPowTargetSpacing;
diff --git a/src/pow.cpp b/src/pow.cpp
index 31995fdf0..8f3c583fe 100644
--- a/src/pow.cpp
+++ b/src/pow.cpp
@@ -18,7 +18,8 @@ unsigned int GetNextWorkRequired(const CBlockIndex* pindexLast, const CBlockHead
     if (pindexLast == NULL)
         return nProofOfWorkLimit;
 
-    if (params.fPowAllowMinDifficultyBlocks && pindexLast->nHeight >= 277299 && pindexLast->nHeight < 1100000)
+    if (params.fPowAllowMinDifficultyBlocks && pindexLast->nHeight >= params.nAllowMinDiffMinHeight
+                                            && pindexLast->nHeight < params.nAllowMinDiffMaxHeight)
     {
         // Special difficulty rule for testnet:
         // If the new block's timestamp is twice the target block time