diff --git a/test/functional/mining_basic.py b/test/functional/mining_basic.py
index 42412ec49..4b57538e6 100755
--- a/test/functional/mining_basic.py
+++ b/test/functional/mining_basic.py
@@ -9,6 +9,7 @@
 - submitblock"""
 
 import copy
+import struct
 from binascii import b2a_hex
 from decimal import Decimal
 
@@ -17,6 +18,13 @@ from test_framework.mininode import CBlock
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import assert_equal, assert_raises_rpc_error
 
+def uint256_from_str(s):
+    r = 0
+    t = struct.unpack("<IIIIIIII", s[:32])
+    for i in range(8):
+        r += t[i] << (i * 32)
+    return r
+
 def b2x(b):
     return b2a_hex(b).decode('ascii')
 
@@ -40,7 +48,7 @@ class MiningTest(BitcoinTestFramework):
         assert_equal(mining_info['chain'], 'regtest')
         assert_equal(mining_info['currentblocktx'], 0)
         assert_equal(mining_info['currentblockweight'], 0)
-        assert_equal(mining_info['difficulty'], Decimal('0.0004882738576261828'))
+        assert_equal(mining_info['difficulty'], Decimal('1.999969720836845'))
         assert_equal(mining_info['networkhashps'], Decimal('0.003333333333333334'))
         assert_equal(mining_info['pooledtx'], 0)
 
@@ -64,6 +72,10 @@ class MiningTest(BitcoinTestFramework):
         block.nNonce = 0
         block.vtx = [coinbase_tx]
 
+        block.major_version = 10
+        block.merkle_root = uint256_from_str(bytes.fromhex("3cf6c3b6da3f4058853ee70369ee43d473aca91ae8fc8f44a645beb21c392d80"))
+        block.calc_sha256()
+
         self.log.info("getblocktemplate: Test valid block")
         assert_template(node, block, None)
 
@@ -103,7 +115,7 @@ class MiningTest(BitcoinTestFramework):
 
         self.log.info("getblocktemplate: Test bad tx count")
         # The tx count is immediately after the block header
-        TX_COUNT_OFFSET = 80
+        TX_COUNT_OFFSET = 80 + 78   # Kevacoin: 78 is the size of the cnHeader.
         bad_block_sn = bytearray(block.serialize())
         assert_equal(bad_block_sn[TX_COUNT_OFFSET], 1)
         bad_block_sn[TX_COUNT_OFFSET] += 1
diff --git a/test/functional/rpc_blockchain.py b/test/functional/rpc_blockchain.py
index 515eed56c..fb71a8495 100755
--- a/test/functional/rpc_blockchain.py
+++ b/test/functional/rpc_blockchain.py
@@ -202,7 +202,7 @@ class BlockchainTest(BitcoinTestFramework):
         # 1 hash in 2 should be valid, so difficulty should be 1/2**31
         # binary => decimal => binary math is why we do this check
         # assert abs(difficulty * 2**31 - 1) < 0.0001
-        assert abs(difficulty) < 0.0005  # Kevacoin change
+        assert abs(difficulty) < 2.0  # Kevacoin change
 
     def _test_getnetworkhashps(self):
         hashes_per_second = self.nodes[0].getnetworkhashps()
diff --git a/test/functional/test_framework/messages.py b/test/functional/test_framework/messages.py
index faec0beb6..e484e36ab 100644
--- a/test/functional/test_framework/messages.py
+++ b/test/functional/test_framework/messages.py
@@ -633,8 +633,9 @@ class CBlockHeader():
             c += ser_uint256(self.merkle_root)
             c += struct.pack("<B", self.nTxes)
             # self.sha256 stores the cn_fast hash.
-            self.sha256 = uint256_from_str(pycryptonight.cn_fast_hash(c))
-            self.hash = encode(pycryptonight.cn_fast_hash(c)[::-1], 'hex_codec').decode('ascii')
+            cn_hash = pycryptonight.cn_fast_hash(c)
+            self.sha256 = uint256_from_str(cn_hash)
+            self.hash = encode(cn_hash[::-1], 'hex_codec').decode('ascii')
             # nNonce is used to store block height.
             self.scrypt256 = uint256_from_str(pycryptonight.cn_slow_hash(c, self.major_version - 6, 0, self.nNonce))