diff --git a/packages/gitbook/src/components/Header/HeaderMobileMenu.tsx b/packages/gitbook/src/components/Header/HeaderMobileMenu.tsx
index 0ce33e9b6..e8234c50f 100644
--- a/packages/gitbook/src/components/Header/HeaderMobileMenu.tsx
+++ b/packages/gitbook/src/components/Header/HeaderMobileMenu.tsx
@@ -30,7 +30,7 @@ export function HeaderMobileMenu(props: Partial<React.ButtonHTMLAttributes<HTMLB
         }
     };
 
-    const windowRef = useRef(typeof window === 'undefined' ? null : window);
+    const windowRef = useRef(window);
     useScrollListener(() => {
         if (window.scrollY >= scrollDistance) {
             setHasScrolled(true);