diff --git a/chain/messagepool/selection.go b/chain/messagepool/selection.go
index 8a0f94bd5cd..792d4ca5061 100644
--- a/chain/messagepool/selection.go
+++ b/chain/messagepool/selection.go
@@ -22,7 +22,7 @@ var bigBlockGasLimit = big.NewInt(build.BlockGasLimit)
 // this is *temporary* mutilation until we have implemented uncapped miner penalties -- it will go
 // away in the next fork.
 func allowNegativeChains(epoch abi.ChainEpoch) bool {
-	return epoch < 100000000000
+	return epoch < build.BreezeGasTampingDuration+5
 }
 
 const MaxBlocks = 15