diff --git a/conf/config_sample.py b/conf/config_sample.py
index ed90b263..9fd0f6bd 100644
--- a/conf/config_sample.py
+++ b/conf/config_sample.py
@@ -18,7 +18,7 @@
 ALGO_NAME = 'lyra2re2_hash'      # Name of module implementing getPoWHash
 COINDAEMON_TX = False         # For Coins which support TX Messages please enter yes in the TX selection
 COINDAEMON_HAS_SEGWIT = False
-#CUSTOM_HEADER = "000000800000000000000000000000000000000000000000000000000000000000000000000000000000000080020000"
+#CUSTOM_HEADER =  "000000800000000000000000000000000000000000000000000000000000000000000000000000000000000080020000"
 #CUSTOM_DIFF1 = 0x0000ffff00000000000000000000000000000000000000000000000000000000 # Scrypt
 #COINDAEMON_REWARD = 'POW' If it needs to be overridden i believe
 # ******************** BASIC SETTINGS ***************
diff --git a/lib/block_template.py b/lib/block_template.py
index f94633e3..2ebb7e66 100644
--- a/lib/block_template.py
+++ b/lib/block_template.py
@@ -194,7 +194,7 @@ def serialize(self):
         return ''.join(r)
 
     def is_valid(self):
-        self.calc_sha256()
+        self.calc_hash()
         target = util.uint256_from_compact(self.nBits)
         if self.sha256 > self.target:
             return False