diff --git a/assets/js/theme/nav/mainMenu.js b/assets/js/theme/nav/mainMenu.js
index 510508f2b7da30aa7ab2b44f0ad3e570ecb8024e..3ea45a6d8a02d2deb4a19e848e04bfeba1d17ea8 100644
--- a/assets/js/theme/nav/mainMenu.js
+++ b/assets/js/theme/nav/mainMenu.js
@@ -52,7 +52,8 @@ class MainMenu {
 
     resize () {
         const isMobile = window.innerWidth <= breakpoints.md;
-        // document.documentElement.style.setProperty('--header-height', this.element.offsetHeight + 'px');
+        document.documentElement.style.setProperty('--header-height', this.element.offsetHeight + 'px');
+
         // is state changed ?
         if (this.state.isMobile === isMobile) {
             return null;