diff --git a/tests/test_blockchain_json.nim b/tests/test_blockchain_json.nim
index b2f5522a7..619305121 100644
--- a/tests/test_blockchain_json.nim
+++ b/tests/test_blockchain_json.nim
@@ -451,7 +451,7 @@ proc validateUncles(chainDB: BaseChainDB, currBlock: PlainBlock, checkSeal: bool
     validateUncle(currBlock.header, uncle, uncleParent)
 
 func isGenesis(currBlock: PlainBlock): bool =
-  result = currBlock.header.blockNumber == 0.u256
+  result = currBlock.header.blockNumber == 0.u256 and currBlock.header.parentHash == GENESIS_PARENT_HASH
 
 proc validateBlock(chainDB: BaseChainDB, currBlock: PlainBlock, checkSeal: bool): bool =
   if currBlock.isGenesis: