diff --git a/theme/boost/settings.php b/theme/boost/settings.php
index 46f9d9a4aca..70890ca6893 100644
--- a/theme/boost/settings.php
+++ b/theme/boost/settings.php
@@ -32,7 +32,6 @@ if ($ADMIN->fulltree) {
     $default = 'navigation,settings,course_list,section_links';
     $setting = new admin_setting_configtext('theme_boost/unaddableblocks',
         get_string('unaddableblocks', 'theme_boost'), get_string('unaddableblocks_desc', 'theme_boost'), $default, PARAM_TEXT);
-    $setting->set_updatedcallback('theme_reset_all_caches');
     $page->add($setting);
 
     // Preset.
diff --git a/theme/classic/settings.php b/theme/classic/settings.php
index 40cad98ae81..1affb11f31e 100644
--- a/theme/classic/settings.php
+++ b/theme/classic/settings.php
@@ -38,7 +38,6 @@ if ($ADMIN->fulltree) {
     // Unaddable blocks.
     $setting = new admin_setting_configtext('theme_classic/unaddableblocks',
         get_string('unaddableblocks', 'theme_boost'), get_string('unaddableblocks_desc', 'theme_boost'), '', PARAM_TEXT);
-    $setting->set_updatedcallback('theme_reset_all_caches');
     $page->add($setting);
 
     // Preset.