diff --git a/op-challenger/game/fault/trace/vm/op_program_server_executor.go b/op-challenger/game/fault/trace/vm/op_program_server_executor.go
index c56d3aa4b79d0..1a5da6b9310b0 100644
--- a/op-challenger/game/fault/trace/vm/op_program_server_executor.go
+++ b/op-challenger/game/fault/trace/vm/op_program_server_executor.go
@@ -73,7 +73,7 @@ func (s *OpProgramServerExecutor) OracleCommand(cfg Config, dataDir string, inpu
 		args = append(args, "--l2.custom")
 	}
 	if cfg.L1GenesisPath != "" {
-		args = append(args, "--l1.config", cfg.L1GenesisPath)
+		args = append(args, "--l1.chainconfig", cfg.L1GenesisPath)
 	}
 	return args, nil
 }
diff --git a/op-challenger/game/fault/trace/vm/op_program_server_executor_test.go b/op-challenger/game/fault/trace/vm/op_program_server_executor_test.go
index 37fa6a2600733..473317878c695 100644
--- a/op-challenger/game/fault/trace/vm/op_program_server_executor_test.go
+++ b/op-challenger/game/fault/trace/vm/op_program_server_executor_test.go
@@ -61,7 +61,7 @@ func TestOpProgramFillHostCommand(t *testing.T) {
 		require.Equal(t, inputs.L1Head.Hex(), pairs["--l1.head"])
 		require.Equal(t, inputs.L2Claim.Hex(), pairs["--l2.claim"])
 		require.Equal(t, inputs.L2SequenceNumber.String(), pairs["--l2.blocknumber"])
-		require.Equal(t, cfg.L1GenesisPath, pairs["--l1.config"])
+		require.Equal(t, cfg.L1GenesisPath, pairs["--l1.chainconfig"])
 		return pairs
 	}