diff --git a/sin-executor/config/config.go b/sin-executor/config/config.go
index 015bce6cda..586e24b41e 100644
--- a/sin-executor/config/config.go
+++ b/sin-executor/config/config.go
@@ -9,7 +9,7 @@ import (
 // Config is the config for the Synapse module.
 type Config struct {
 	// Chains is a map of chain IDs to execution service contract addresses.
-	Chains map[int]ChainConfig `yaml:"chains"`
+	Chains []ChainConfig `yaml:"chains"`
 	// OmnirpcURL is the URL of the Omni RPC.
 	OmnirpcURL string `yaml:"omnirpc_url"`
 	// Database is the database config.
@@ -21,6 +21,8 @@ type Config struct {
 }
 
 type ChainConfig struct {
+	// ChainID is the chain ID.
+	ChainID int `yaml:"id"`
 	// ExecutionService is the address of the execution service contract.
 	ExecutionService string `yaml:"execution_service"`
 	// Client is the address of the interchain client contract.
diff --git a/sin-executor/executor/executor.go b/sin-executor/executor/executor.go
index c8f323277b..f8fee0c4e6 100644
--- a/sin-executor/executor/executor.go
+++ b/sin-executor/executor/executor.go
@@ -3,11 +3,12 @@ package executor
 import (
 	"context"
 	"fmt"
-	"github.com/synapsecns/sanguine/core"
-	"github.com/synapsecns/sanguine/sin-executor/contracts/executionservice"
 	"math/big"
 	"time"
 
+	"github.com/synapsecns/sanguine/core"
+	"github.com/synapsecns/sanguine/sin-executor/contracts/executionservice"
+
 	"github.com/ethereum/go-ethereum/accounts/abi/bind"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core/types"
@@ -60,10 +61,10 @@ func NewExecutor(ctx context.Context, handler metrics.Handler, cfg config.Config
 	executor.chainListeners = make(map[int]listener.ContractListener)
 	executor.clientContracts = make(map[int]*interchainclient.InterchainClientRef)
 
-	for chainID, chainCfg := range cfg.Chains {
+	for _, chainCfg := range cfg.Chains {
 		executionService := common.HexToAddress(chainCfg.ExecutionService)
 		interchainClient := common.HexToAddress(chainCfg.Client)
-		chainClient, err := executor.client.GetChainClient(ctx, chainID)
+		chainClient, err := executor.client.GetChainClient(ctx, chainCfg.ChainID)
 		if err != nil {
 			return nil, fmt.Errorf("could not get chain client: %w", err)
 		}
@@ -72,9 +73,9 @@ func NewExecutor(ctx context.Context, handler metrics.Handler, cfg config.Config
 		if err != nil {
 			return nil, fmt.Errorf("could not get chain listener: %w", err)
 		}
-		executor.chainListeners[chainID] = chainListener
+		executor.chainListeners[chainCfg.ChainID] = chainListener
 
-		executor.clientContracts[chainID], err = interchainclient.NewInterchainClientRef(interchainClient, chainClient)
+		executor.clientContracts[chainCfg.ChainID], err = interchainclient.NewInterchainClientRef(interchainClient, chainClient)
 		if err != nil {
 			return nil, fmt.Errorf("could not get synapse module ref: %w", err)
 		}
@@ -226,8 +227,8 @@ func (e *Executor) startChainIndexers(ctx context.Context) error {
 	g, ctx := errgroup.WithContext(ctx)
 
 	// TODO: good chance we wanna prepare these chain listeners up front and then listen later.
-	for chainID := range e.cfg.Chains {
-		chainID := chainID // capture func litera
+	for _, chain := range e.cfg.Chains {
+		chainID := chain.ChainID // capture func litera
 
 		g.Go(func() error {
 			err := e.runChainIndexer(ctx, chainID)
diff --git a/sin-executor/executor/suite_test.go b/sin-executor/executor/suite_test.go
index b33d717ed6..be5a876942 100644
--- a/sin-executor/executor/suite_test.go
+++ b/sin-executor/executor/suite_test.go
@@ -3,6 +3,10 @@ package executor_test
 import (
 	"context"
 	"errors"
+	"math/big"
+	"sync"
+	"testing"
+
 	"github.com/Flaque/filet"
 	"github.com/ethereum/go-ethereum/accounts/abi/bind"
 	"github.com/ethereum/go-ethereum/common"
@@ -22,9 +26,6 @@ import (
 	"github.com/synapsecns/sanguine/sin-executor/contracts/interchainclient"
 	"github.com/synapsecns/sanguine/sin-executor/executor"
 	"github.com/synapsecns/sanguine/sin-executor/testutil"
-	"math/big"
-	"sync"
-	"testing"
 )
 
 // InterchainSuite is a test suite for the interchain package.
@@ -135,12 +136,14 @@ func (i *InterchainSuite) makeExecutor() {
 	destOwner, execServiceDest := i.deployManager.GetExecutionService(i.GetTestContext(), i.destChain)
 
 	cfg := config.Config{
-		Chains: map[int]config.ChainConfig{
-			1: {
+		Chains: []config.ChainConfig{
+			{
+				ChainID:          1,
 				ExecutionService: execServiceOrigin.Address().String(),
 				Client:           i.originModule.Address().String(),
 			},
-			2: {
+			{
+				ChainID:          2,
 				ExecutionService: execServiceDest.Address().String(),
 				Client:           i.destModule.Address().String(),
 			},