diff --git a/internal/runtime/docker.go b/internal/runtime/docker.go
index dddb9af..f00c0ca 100644
--- a/internal/runtime/docker.go
+++ b/internal/runtime/docker.go
@@ -107,10 +107,12 @@ func (d *DockerRuntime) PullImage(ctx context.Context, imageName string, progres
 	return nil
 }
 
+const emulatorContainerPort = nat.Port("4566/tcp")
+
 func (d *DockerRuntime) Start(ctx context.Context, config ContainerConfig) (string, error) {
-	port := nat.Port(config.Port + "/tcp")
-	exposedPorts := nat.PortSet{port: struct{}{}}
-	portBindings := nat.PortMap{port: []nat.PortBinding{{HostPort: config.Port}}}
+	containerPort := emulatorContainerPort
+	exposedPorts := nat.PortSet{containerPort: struct{}{}}
+	portBindings := nat.PortMap{containerPort: []nat.PortBinding{{HostPort: config.Port}}}
 
 	resp, err := d.client.ContainerCreate(ctx,
 		&container.Config{
diff --git a/test/integration/start_test.go b/test/integration/start_test.go
index 2bf88f6..ec8246a 100644
--- a/test/integration/start_test.go
+++ b/test/integration/start_test.go
@@ -3,6 +3,8 @@ package integration_test
 import (
 	"context"
 	"net"
+	"os"
+	"path/filepath"
 	"testing"
 
 	"github.com/docker/docker/api/types/container"
@@ -95,6 +97,30 @@ func TestStartCommandFailsWhenPortInUse(t *testing.T) {
 	assert.Contains(t, stdout, "lstk stop")
 }
 
+func TestStartCommandSucceedsWithNonDefaultPort(t *testing.T) {
+	requireDocker(t)
+	_ = env.Require(t, env.AuthToken)
+
+	cleanup()
+	t.Cleanup(cleanup)
+
+	mockServer := createMockLicenseServer(true)
+	defer mockServer.Close()
+
+	configContent := `
+[[containers]]
+type = "aws"
+tag = "latest"
+port = "4567"
+`
+	configFile := filepath.Join(t.TempDir(), "config.toml")
+	require.NoError(t, os.WriteFile(configFile, []byte(configContent), 0644))
+
+	ctx := testContext(t)
+	_, stderr, err := runLstk(t, ctx, "", env.With(env.APIEndpoint, mockServer.URL), "--config", configFile, "start")
+	require.NoError(t, err, "lstk start failed: %s", stderr)
+}
+
 func cleanup() {
 	ctx := context.Background()
 	_ = dockerClient.ContainerStop(ctx, containerName, container.StopOptions{})