diff --git a/core/modules/system/system.post_update.php b/core/modules/system/system.post_update.php
index 8c63fe46a2..803f362dac 100644
--- a/core/modules/system/system.post_update.php
+++ b/core/modules/system/system.post_update.php
@@ -168,11 +168,3 @@ function system_post_update_schema_version_int() {
     }
   }
 }
-
-/**
- * Clear cache after moving HTML classes from claro_preprocess_textarea to a
- * template.
- */
-function system_post_update_remove_claro_preprocess() {
-  // Empty post-update hook.
-}