diff --git a/app/javascript/mastodon/utils/theme.ts b/app/javascript/mastodon/utils/theme.ts
index 767d97cf5c..921787a6c4 100644
--- a/app/javascript/mastodon/utils/theme.ts
+++ b/app/javascript/mastodon/utils/theme.ts
@@ -5,9 +5,7 @@ export function getUserTheme() {
 
 export function isDarkMode() {
   const { userTheme } = document.documentElement.dataset;
-  return (
-    (userTheme === 'system' &&
-      window.matchMedia('(prefers-color-scheme: dark)').matches) ||
-    userTheme !== 'mastodon-light'
-  );
+  return userTheme === 'system'
+    ? window.matchMedia('(prefers-color-scheme: dark)').matches
+    : userTheme !== 'mastodon-light';
 }