diff --git a/libethcore/Common.cpp b/libethcore/Common.cpp
index b95564b9b..85121c4f0 100644
--- a/libethcore/Common.cpp
+++ b/libethcore/Common.cpp
@@ -65,7 +65,7 @@ Network resetNetwork(Network _n)
 	c_gasLimitBoundDivisor = 1024;
 	c_minimumDifficulty = 131072;
 	c_difficultyBoundDivisor = 2048;
-	c_durationLimit = c_network == Network::Turbo ? 2 : c_network == Network::Olympic ? 8 : 12;
+	c_durationLimit = c_network == Network::Turbo ? 2 : c_network == Network::Olympic ? 8 : 13;
 	c_blockReward = c_network == Network::Olympic ? (1500 * finney) : (5 * ether);
 	return _n;
 }