diff --git a/src/primitives/block.cpp b/src/primitives/block.cpp
index 46d0dd54ad426..8251c873afef6 100644
--- a/src/primitives/block.cpp
+++ b/src/primitives/block.cpp
@@ -21,24 +21,24 @@ uint256 CBlockHeader::GetPoWHash() const
     uint256 thash;
     unsigned char Nfactor;
     const unsigned char minNfactor = 10;
-  	const unsigned char maxNfactor = 20;
+    const unsigned char maxNfactor = 20;
 
-  	// epoch times of chain start and current block time
-  	int64_t nChainStartTime = 1515925970;
+    // epoch times of chain start and current block time
+    int64_t nChainStartTime = 1515925970;
 
-  	// n-factor will change every this interval is hit
-  	int64_t nChangeInterval = 36288000; //200 days
+    // n-factor will change every this interval is hit
+    int64_t nChangeInterval = 36288000; // 420 days
 
     if (GetBlockTime() <= nChainStartTime) {
-  		Nfactor = minNfactor;
-  	} else {
-  		int64_t s = GetBlockTime() - nChainStartTime;
-  		int n = s/nChangeInterval + 10;
-
-  		if (n < 0) n = 0;
-  		unsigned char tempN = (unsigned char) n;
-  		Nfactor = std::min(std::max(tempN, minNfactor), maxNfactor);
-  	}
+        Nfactor = minNfactor;
+    } else {
+        int64_t s = GetBlockTime() - nChainStartTime;
+        int n = s/nChangeInterval + 10;
+
+        if (n < 0) n = 0;
+        unsigned char tempN = (unsigned char) n;
+        Nfactor = std::min(std::max(tempN, minNfactor), maxNfactor);
+    }
     scrypt_N_1_1_256(BEGIN(nVersion), BEGIN(thash), Nfactor);
     return thash;
 }