diff --git a/block_manager.go b/block_manager.go
index 21162f36b..1a73a45f2 100644
--- a/block_manager.go
+++ b/block_manager.go
@@ -139,7 +139,7 @@ func (bm *BlockManager) ValidateBlock(block *ethutil.Block) error {
 	}
 
 	// Verify the nonce of the block. Return an error if it's not valid
-	if !DaggerVerify(block.Hash(), block.Nonce) {
+	if !DaggerVerify(ethutil.BigD(block.Hash()), block.Difficulty, block.Nonce) {
 		return errors.New("Block's nonce is invalid")
 	}