diff --git a/lib/classes/output/icon_system_fontawesome.php b/lib/classes/output/icon_system_fontawesome.php
index 3d9593a1abb..89edd5905a8 100644
--- a/lib/classes/output/icon_system_fontawesome.php
+++ b/lib/classes/output/icon_system_fontawesome.php
@@ -309,7 +309,7 @@ class icon_system_fontawesome extends icon_system_font {
             'core:t/block' => 'fa-ban',
             'core:t/block_to_dock_rtl' => 'fa-chevron-right',
             'core:t/block_to_dock' => 'fa-chevron-left',
-            'core:t/calc_off' => 'fa-times fa-cross',
+            'core:t/calc_off' => 'fa-calculator', // TODO: Change to better icon once we have stacked icon support or more icons.
             'core:t/calc' => 'fa-calculator',
             'core:t/check' => 'fa-check',
             'core:t/cohort' => 'fa-users',