diff --git a/addons/web/static/src/js/view_form.js b/addons/web/static/src/js/view_form.js
index 5f12c82167e..5f73f34e723 100644
--- a/addons/web/static/src/js/view_form.js
+++ b/addons/web/static/src/js/view_form.js
@@ -1654,6 +1654,9 @@ instance.web.form.WidgetButton = instance.web.form.FormWidget.extend({
             // TODO fme: provide enter key binding to widgets
             this.view.default_focus_button = this;
         }
+        if (this.node.attrs.icon && (! /\//.test(this.node.attrs.icon))) {
+            this.node.attrs.icon = '/web/static/src/img/icons/' + this.node.attrs.icon + '.png';
+        }
         this.view.on('view_content_has_changed', this, this.check_disable);
     },
     start: function() {
diff --git a/addons/web/static/src/xml/base.xml b/addons/web/static/src/xml/base.xml
index 4ce36fe86d4..2cbda972719 100644
--- a/addons/web/static/src/xml/base.xml
+++ b/addons/web/static/src/xml/base.xml
@@ -1133,7 +1133,7 @@
         t-att-style="widget.node.attrs.style"
         t-att-tabindex="widget.node.attrs.tabindex"
         t-att-autofocus="widget.node.attrs.autofocus">
-        <img t-if="widget.node.attrs.icon" t-att-src="_s + '/web/static/src/img/icons/' + widget.node.attrs.icon + '.png'" width="16" height="16"/>
+        <img t-if="widget.node.attrs.icon" t-att-src="_s + widget.node.attrs.icon" width="16" height="16"/>
         <span t-if="widget.string"><t t-esc="widget.string"/></span>
     </button>
 </t>