diff --git a/params/protocol_params.go b/params/protocol_params.go
index ce534b6111..e6bb619ccf 100644
--- a/params/protocol_params.go
+++ b/params/protocol_params.go
@@ -83,5 +83,5 @@ var (
 	DifficultyBoundDivisor = big.NewInt(2048)   // The bound divisor of the difficulty, used in the update calculations.
 	GenesisDifficulty      = big.NewInt(131072) // Difficulty of the Genesis block.
 	MinimumDifficulty      = big.NewInt(131072) // The minimum that the difficulty may ever be.
-	DurationLimit          = big.NewInt(4)     // The decision boundary on the blocktime duration used to determine whether difficulty should go up or not.
+	DurationLimit          = big.NewInt(7)     // The decision boundary on the blocktime duration used to determine whether difficulty should go up or not.
 )