diff --git a/op-e2e/actions/l1_miner.go b/op-e2e/actions/l1_miner.go
index 70c5059a16c0..c9d085877bf6 100644
--- a/op-e2e/actions/l1_miner.go
+++ b/op-e2e/actions/l1_miner.go
@@ -67,7 +67,7 @@ func (s *L1Miner) ActL1StartBlock(timeDelta uint64) Action {
 			MixDigest:  common.Hash{}, // TODO: maybe randomize this (prev-randao value)
 		}
 		if s.l1Cfg.Config.IsLondon(header.Number) {
-			header.BaseFee = eip1559.CalcBaseFee(s.l1Cfg.Config, parent)
+			header.BaseFee = eip1559.CalcBaseFee(s.l1Cfg.Config, parent, header.Time)
 			// At the transition, double the gas limit so the gas target is equal to the old gas limit.
 			if !s.l1Cfg.Config.IsLondon(parent.Number) {
 				header.GasLimit = parent.GasLimit * s.l1Cfg.Config.ElasticityMultiplier()
diff --git a/op-program/client/l2/engineapi/block_processor.go b/op-program/client/l2/engineapi/block_processor.go
index 22c6e1441401..c6966e0d94c2 100644
--- a/op-program/client/l2/engineapi/block_processor.go
+++ b/op-program/client/l2/engineapi/block_processor.go
@@ -68,7 +68,7 @@ func NewBlockProcessorFromHeader(provider BlockDataProvider, h *types.Header) (*
 		return nil, fmt.Errorf("get parent state: %w", err)
 	}
 	header.Number = new(big.Int).Add(parentHeader.Number, common.Big1)
-	header.BaseFee = eip1559.CalcBaseFee(provider.Config(), parentHeader)
+	header.BaseFee = eip1559.CalcBaseFee(provider.Config(), parentHeader, header.Time)
 	header.GasUsed = 0
 	gasPool := new(core.GasPool).AddGas(header.GasLimit)
 	return &BlockProcessor{