diff --git a/consensus/ethash/consensus.go b/consensus/ethash/consensus.go
index 92a23d4a4d..597d15ad58 100644
--- a/consensus/ethash/consensus.go
+++ b/consensus/ethash/consensus.go
@@ -38,8 +38,8 @@ import (
 var (
 	FrontierBlockReward    *big.Int = big.NewInt(5e+18) // Block reward in wei for successfully mining a block
 	ByzantiumBlockReward   *big.Int = big.NewInt(3e+18) // Block reward in wei for successfully mining a block upward from Byzantium
-	maxUncles                       = 2                 // Maximum number of uncles allowed in a single block
-	allowedFutureBlockTime          = 15 * time.Second  // Max time from current time allowed for blocks, before they're considered future blocks
+	maxUncles                       = 0                 // Maximum number of uncles allowed in a single block
+	allowedFutureBlockTime          = 7 * time.Second  // Max time from current time allowed for blocks, before they're considered future blocks
 )
 
 // Various error messages to mark blocks invalid. These should be private to