diff --git a/addons/web/static/src/legacy/js/core/menu.js b/addons/web/static/src/legacy/js/core/menu.js
index 0e37072c9a4..8dde15aec47 100644
--- a/addons/web/static/src/legacy/js/core/menu.js
+++ b/addons/web/static/src/legacy/js/core/menu.js
@@ -158,10 +158,11 @@ export async function initAutoMoreMenu(el, options) {
         var rect = el.getBoundingClientRect();
         var style = window.getComputedStyle(el);
         var outerWidth = rect.right - rect.left;
-        if (mLeft !== false && (considerAutoMargins || !autoMarginLeftRegex.test(el.getAttribute('class')))) {
+        const isRTL = style.direction === 'rtl';
+        if (mLeft !== false && (considerAutoMargins || !(isRTL ? autoMarginRightRegex : autoMarginLeftRegex).test(el.getAttribute('class')))) {
             outerWidth += parseFloat(style.marginLeft);
         }
-        if (mRight !== false && (considerAutoMargins || !autoMarginRightRegex.test(el.getAttribute('class')))) {
+        if (mRight !== false && (considerAutoMargins || !(isRTL ? autoMarginLeftRegex : autoMarginRightRegex).test(el.getAttribute('class')))) {
             outerWidth += parseFloat(style.marginRight);
         }
         // Would be NaN for invisible elements for example