diff --git a/core/modules/file/file.es6.js b/core/modules/file/file.es6.js
index 428d5a48c70eb335cbc4292963138c3e777217c0..6923e95249858e39e56467a14d51ccb552e66312 100644
--- a/core/modules/file/file.es6.js
+++ b/core/modules/file/file.es6.js
@@ -181,12 +181,7 @@
      *   The event triggered, most likely a `mousedown` event.
      */
     disableFields(event) {
-      const $clickedButton = $(this).findOnce('ajax');
-
-      // Only disable upload fields for Ajax buttons.
-      if (!$clickedButton.length) {
-        return;
-      }
+      const $clickedButton = $(this);
 
       // Check if we're working with an "Upload" button.
       let $enabledFields = [];
diff --git a/core/modules/file/file.js b/core/modules/file/file.js
index e87180a1612597fd3226fe62ada803521c0ffa63..604ccb772f83242bab770ba6805e4f344a6509dd 100644
--- a/core/modules/file/file.js
+++ b/core/modules/file/file.js
@@ -95,11 +95,7 @@
       $(event.target).closest('.js-form-managed-file').find('.js-form-submit').trigger('mousedown');
     },
     disableFields: function disableFields(event) {
-      var $clickedButton = $(this).findOnce('ajax');
-
-      if (!$clickedButton.length) {
-        return;
-      }
+      var $clickedButton = $(this);
 
       var $enabledFields = [];
       if ($clickedButton.closest('div.js-form-managed-file').length > 0) {