diff --git a/src/cryptonote_core/blockchain.cpp b/src/cryptonote_core/blockchain.cpp
index 6b6b775..f1d6df5 100644
--- a/src/cryptonote_core/blockchain.cpp
+++ b/src/cryptonote_core/blockchain.cpp
@@ -74,6 +74,7 @@ DISABLE_VS_WARNINGS(4267)
 
 // used to overestimate the block reward when estimating a per kB to use
 #define BLOCK_REWARD_OVERESTIMATE   ((uint64_t)(16000000000))
+#define MAINNET_HARDFORK_V3_HEIGHT  ((uint64_t)(116520))
 
 static const struct {
   uint8_t version;
@@ -83,7 +84,7 @@ static const struct {
 } mainnet_hard_forks[] = {
   { 1, 1, 0, 1482806500 },
   { 2, 21300, 0, 1497657600 },
-  { 3, 116520, 0, 1522800000 }
+  { 3, MAINNET_HARDFORK_V3_HEIGHT, 0, 1522800000 }
 };
 static const uint64_t mainnet_hard_fork_version_1_till = (uint64_t)-1;
 
@@ -676,6 +677,11 @@ difficulty_type Blockchain::get_difficulty_for_next_block()
   std::vector<uint64_t> timestamps;
   std::vector<difficulty_type> difficulties;
   auto height = m_db->height();
+  // Reset network hashrate to 2.0 MHz when hardfork v3 comes
+  if (!m_testnet && (uint64_t)height >= MAINNET_HARDFORK_V3_HEIGHT && (uint64_t)height <= MAINNET_HARDFORK_V3_HEIGHT + (uint64_t)DIFFICULTY_BLOCKS_COUNT_V2){
+    return (difficulty_type) 480000000;
+  }
+
   size_t difficult_block_count = get_current_hard_fork_version() < 2 ? DIFFICULTY_BLOCKS_COUNT : DIFFICULTY_BLOCKS_COUNT_V2;
 
   // ND: Speedup