diff --git a/app/assets/images/icons.svg b/app/assets/images/icons.svg
index f100919e3..6283537ce 100644
--- a/app/assets/images/icons.svg
+++ b/app/assets/images/icons.svg
@@ -228,12 +228,6 @@
       <path d="M12 8l0 4l2 2"/>
       <path d="M3.05 11a9 9 0 1 1 .5 4m-.5 5v-5h5"/>
     </symbol>
-    <symbol viewBox="0 0 24 24" stroke-linecap="round" stroke-linejoin="round" id="icon--hourglass">
-      <path d="M6.5 7h11"/>
-      <path d="M6.5 17h11"/>
-      <path d="M6 20v-2a6 6 0 1 1 12 0v2a1 1 0 0 1 -1 1h-10a1 1 0 0 1 -1 -1z"/>
-      <path d="M6 4v2a6 6 0 1 0 12 0v-2a1 1 0 0 0 -1 -1h-10a1 1 0 0 0 -1 1z"/>
-    </symbol>
     <symbol viewBox="0 0 24 24" stroke-linecap="round" stroke-linejoin="round" id="icon--image-gif">
       <path d="M14 3v4a1 1 0 0 0 1 1h4"/>
       <path d="M17 21h-10a2 2 0 0 1 -2 -2v-14a2 2 0 0 1 2 -2h7l5 5v11a2 2 0 0 1 -2 2z"/>
@@ -307,9 +301,6 @@
       <path d="M5 12l0 .01"/>
       <path d="M5 18l0 .01"/>
     </symbol>
-    <symbol viewBox="0 0 24 24" stroke-linecap="round" stroke-linejoin="round" id="icon--loader">
-      <path d="M12 3a9 9 0 1 0 9 9"/>
-    </symbol>
     <symbol viewBox="0 0 24 24" stroke-linecap="round" stroke-linejoin="round" id="icon--lock">
       <path d="M5 13a2 2 0 0 1 2 -2h10a2 2 0 0 1 2 2v6a2 2 0 0 1 -2 2h-10a2 2 0 0 1 -2 -2v-6z"/>
       <path d="M11 16a1 1 0 1 0 2 0a1 1 0 0 0 -2 0"/>
diff --git a/app/assets/javascripts/attachments.js b/app/assets/javascripts/attachments.js
index 0d823a63f..4c74b2d74 100644
--- a/app/assets/javascripts/attachments.js
+++ b/app/assets/javascripts/attachments.js
@@ -45,13 +45,10 @@ function addFile(inputEl, file, eagerUpload) {
 addFile.nextAttachmentId = 1;
 
 function ajaxUpload(file, attachmentId, fileSpan, inputEl) {
-  let attachmentIcon = $(fileSpan).find('svg.svg-attachment');
 
   function onLoadstart(e) {
     fileSpan.removeClass('ajax-waiting');
     fileSpan.addClass('ajax-loading');
-    attachmentIcon.addClass('svg-loader');
-    updateSVGIcon(attachmentIcon[0], 'loader')
     $('input:submit', $(this).parents('form')).attr('disabled', 'disabled');
   }
 
@@ -79,8 +76,6 @@ function ajaxUpload(file, attachmentId, fileSpan, inputEl) {
       }).always(function() {
         ajaxUpload.uploading--;
         fileSpan.removeClass('ajax-loading');
-        attachmentIcon.removeClass('svg-loader');
-        updateSVGIcon(attachmentIcon[0], 'attachment');
         var form = fileSpan.parents('form');
         if (form.queue('upload').length == 0 && ajaxUpload.uploading == 0) {
           $('input:submit', form).removeAttr('disabled');
@@ -92,7 +87,6 @@ function ajaxUpload(file, attachmentId, fileSpan, inputEl) {
   var progressSpan = $('<div>').insertAfter(fileSpan.find('input.filename'));
   progressSpan.progressbar();
   fileSpan.addClass('ajax-waiting');
-  updateSVGIcon(attachmentIcon[0], 'hourglass');
 
   var maxSyncUpload = $(inputEl).data('max-concurrent-uploads');
 
diff --git a/app/assets/stylesheets/application.css b/app/assets/stylesheets/application.css
index 45a062e1e..e3c4b8158 100644
--- a/app/assets/stylesheets/application.css
+++ b/app/assets/stylesheets/application.css
@@ -1161,6 +1161,20 @@ span.required {color: #bb0000;}
   padding-left: 3px;
   padding-right: 0;
 }
+.attachments_fields .ajax-waiting {
+  padding-left: 16px;
+  background:url(/hourglass-empty.svg) no-repeat 0px 50%;
+}
+.attachments_fields .ajax-waiting .svg-attachment {
+  display: none;
+}
+.attachments_fields .ajax-loading {
+  padding-left: 16px;
+  background: url(/loading.gif) no-repeat 0px 50%;
+}
+.attachments_fields .ajax-loading .svg-attachment {
+  display: none;
+}
 
 a.remove-upload:hover {text-decoration:none !important;}
 .existing-attachment.deleted .filename {text-decoration:line-through; color:#999 !important;}
@@ -1352,13 +1366,14 @@ opacity: 0.5;
 
 html>body #ajax-indicator { position: fixed; }
 
-#ajax-indicator:not(:has(svg)) span {
-  background-position: 0% 40%;
-  background-repeat: no-repeat;
-  background-image: url(/loading.gif);
-  padding-left: 26px;
-  vertical-align: bottom;
+#ajax-indicator span {
+background-position: 0% 40%;
+background-repeat: no-repeat;
+background-image: url(/loading.gif);
+padding-left: 26px;
+vertical-align: bottom;
 }
+
 /***** Calendar *****/
 ul.cal {
   list-style: none;
@@ -2163,19 +2178,6 @@ span.icon-label {
 
 .sort-handle.ajax-loading { background-image: url(/loading.gif); }
 tr.ui-sortable-helper { border:1px solid #e4e4e4; }
-svg.svg-loader {
-  animation: spin 1s linear infinite;
-  transform-origin: center;
-}
-
-@keyframes spin {
-  0% {
-    transform: rotate(0deg);
-  }
-  100% {
-    transform: rotate(360deg);
-  }
-}
 
 .contextual>*:not(:first-child), .buttons>.icon:not(:first-child), .contextual .journal-actions>*:not(:first-child) { margin-left: 5px; }
 
diff --git a/app/views/attachments/_form.html.erb b/app/views/attachments/_form.html.erb
index 11c3ebf76..e5b10fb55 100644
--- a/app/views/attachments/_form.html.erb
+++ b/app/views/attachments/_form.html.erb
@@ -10,8 +10,6 @@
   <span class="attachments_icons hidden">
     <%= sprite_icon('del', icon_only: true, css_class: 'svg-del') %>
     <%= sprite_icon('attachment', icon_only: true, size: 16, css_class: 'svg-attachment') %>
-    <%= sprite_icon('loader', icon_only: true, size: 16, css_class: 'svg-loader') %>
-    <%= sprite_icon('hourglass', icon_only: true, size: 16, css_class: 'svg-hourglass') %>
   </span>
   <span class="attachments_fields">
   <% if saved_attachments.present? %>
diff --git a/app/views/layouts/base.html.erb b/app/views/layouts/base.html.erb
index 4b7b401c1..9e2ef51b5 100644
--- a/app/views/layouts/base.html.erb
+++ b/app/views/layouts/base.html.erb
@@ -127,11 +127,7 @@
     Powered by <%= link_to Redmine::Info.app_name, Redmine::Info.url, :target => '_blank', :rel => 'noopener' %> &copy; 2006-2025 Jean-Philippe Lang
 </div>
 
-<div id="ajax-indicator" style="display:none;">
-  <span class="icon">
-    <%= sprite_icon 'loader', l(:label_loading), css_class: 'svg-loader' %>
-  </span>
-</div>
+<div id="ajax-indicator" style="display:none;"><span><%= l(:label_loading) %></span></div>
 <div id="ajax-modal" style="display:none;"></div>
 <div id="icon-copy-source" style="display: none;"><%= sprite_icon('') %></div>
 
diff --git a/config/icon_source.yml b/config/icon_source.yml
index 1e4c2ae09..b6349461f 100644
--- a/config/icon_source.yml
+++ b/config/icon_source.yml
@@ -237,8 +237,4 @@
   svg: message-report
 - name: quote-filled
   svg: quote
-  style: filled
-- name: loader
-  svg: loader-2
-- name: hourglass
-  svg: hourglass
\ No newline at end of file
+  style: filled
\ No newline at end of file