1 files changed, 2 insertions, 6 deletions

diff --git a/packages/shared/src/stores/Config.ts b/packages/shared/src/stores/Config.ts
index 1a9f924..432945c 100644
--- a/packages/shared/src/stores/Config.ts
+++ b/packages/shared/src/stores/Config.ts
@@ -27,14 +27,10 @@ import {
 
 import { themeSource } from '../schemas';
 
-export const config = types.model("Config", {
-  themeSource: types.enumeration(themeSource.options),
+export const config = types.model('Config', {
+  themeSource: types.optional(types.enumeration(themeSource.options), 'system'),
 });
 
-export const defaultConfig: ConfigSnapshotIn = {
-  themeSource: 'system',
-};
-
 export interface Config extends Instance<typeof config> {}
 
 export interface ConfigSnapshotIn extends SnapshotIn<typeof config> {}