diff --git a/src/node/config.ts b/src/node/config.ts
index 0ecf42d7..9f34ab43 100644
--- a/src/node/config.ts
+++ b/src/node/config.ts
@@ -270,7 +270,7 @@ function resolveSiteDataHead(userConfig?: UserConfig): HeadConfig[] {
       typeof userConfig?.appearance === 'string'
         ? userConfig?.appearance
         : typeof userConfig?.appearance === 'object'
-          ? userConfig.appearance.initialValue ?? 'auto'
+          ? (userConfig.appearance.initialValue ?? 'auto')
           : 'auto'
 
     head.push([