diff --git a/core/includes/theme.inc b/core/includes/theme.inc
index 248c795..89cdc53 100644
--- a/core/includes/theme.inc
+++ b/core/includes/theme.inc
@@ -1697,6 +1697,25 @@ function template_preprocess_table(&$variables) {
 }
 
 /**
+ * Prepares variables for tablesort indicator templates.
+ *
+ * Default template: tablesort-indicator.html.twig.
+ *
+ * @param array $variables
+ *   An associative array containing:
+ *   - style: Set to either 'asc' or 'desc'. This determines which icon to show.
+ */
+function template_preprocess_tablesort_indicator(&$variables) {
+  // Provide the image attributes for an ascending or descending image.
+  if ($variables['style'] == 'asc') {
+    $variables['arrow_asc'] = file_create_url('core/misc/arrow-asc.png');
+  }
+  else {
+    $variables['arrow_desc'] = file_create_url('core/misc/arrow-desc.png');
+  }
+}
+
+/**
  * Prepares variables for item list templates.
  *
  * Default template: item-list.html.twig.
diff --git a/core/modules/system/templates/tablesort-indicator.html.twig b/core/modules/system/templates/tablesort-indicator.html.twig
index 1f0eb9d..5d612fe 100644
--- a/core/modules/system/templates/tablesort-indicator.html.twig
+++ b/core/modules/system/templates/tablesort-indicator.html.twig
@@ -5,12 +5,16 @@
  *
  * Available variables:
  * - style: Either 'asc' or 'desc', indicating the sorting direction.
+ * - arrow_asc: URL to the image for an ascending arrow.
+ * - arrow_desc: URL to the image for a descending arrow.
+ *
+ * @see template_preprocess_tablesort_indicator()
  *
  * @ingroup themeable
  */
 #}
 {% if style == 'asc' -%}
-  <img src="{{ url('core/misc/arrow-asc.png') }}" width="13" height="13" alt="{{ 'sort ascending'|t }}" title="{{ 'sort ascending'|t }}" />
+  <img src="{{ arrow_asc }}" width="13" height="13" alt="{{ 'sort ascending'|t }}" title="{{ 'sort ascending'|t }}" />
 {% else -%}
-  <img src="{{ url('core/misc/arrow-desc.png') }}" width="13" height="13" alt="{{ 'sort descending'|t }}" title="{{ 'sort descending'|t }}" />
+  <img src="{{ arrow_desc }}" width="13" height="13" alt="{{ 'sort descending'|t }}" title="{{ 'sort descending'|t }}" />
 {% endif %}