diff --git a/apps/readest-app/src/hooks/useTheme.ts b/apps/readest-app/src/hooks/useTheme.ts
index 36b95b44..ad32b118 100644
--- a/apps/readest-app/src/hooks/useTheme.ts
+++ b/apps/readest-app/src/hooks/useTheme.ts
@@ -31,6 +31,7 @@ export const useTheme = ({
     customThemes.forEach((customTheme) => {
       applyCustomTheme(customTheme);
     });
+    localStorage.setItem('customThemes', JSON.stringify(customThemes));
   }, [settings]);
 
   useEffect(() => {