diff --git a/addons/web/static/src/views/view_button/view_button.js b/addons/web/static/src/views/view_button/view_button.js
index 7e2dc92fd76..09e6632e5f7 100644
--- a/addons/web/static/src/views/view_button/view_button.js
+++ b/addons/web/static/src/views/view_button/view_button.js
@@ -25,10 +25,10 @@ function iconFromString(iconString) {
     const icon = {};
     if (iconString.startsWith("fa-")) {
         icon.tag = "i";
-        icon.class = `o_button_icon fa ${iconString}`;
+        icon.class = `o_button_icon fa fa-fw ${iconString}`;
     } else if (iconString.startsWith("oi-")) {
         icon.tag = "i";
-        icon.class = `o_button_icon oi ${iconString}`;
+        icon.class = `o_button_icon oi oi-fw ${iconString}`;
     } else {
         icon.tag = "img";
         icon.src = iconString;