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-rw-r--r--core/chain_manager.go1
1 files changed, 1 insertions, 0 deletions
diff --git a/core/chain_manager.go b/core/chain_manager.go
index ec479db25..ee73145c1 100644
--- a/core/chain_manager.go
+++ b/core/chain_manager.go
@@ -69,6 +69,7 @@ func CalcGasLimit(parent *types.Block) *big.Int {
gl := new(big.Int).Sub(parent.GasLimit(), decay)
gl = gl.Add(gl, contrib)
+ gl = gl.Add(gl, big.NewInt(1))
gl = common.BigMax(gl, params.MinGasLimit)
if gl.Cmp(params.GenesisGasLimit) < 0 {