diff -u b/core/modules/system/system.install b/core/modules/system/system.install
--- b/core/modules/system/system.install
+++ b/core/modules/system/system.install
@@ -2188,15 +2188,6 @@
 }
 
 /**
- * Remove the drupal_js_cache_files variable.
- *
- * @see http://drupal.org/node/1798724
- */
-function system_update_8031() {
-  update_variable_del('drupal_js_cache_files');
-}
-
-/**
  * @} End of "defgroup updates-7.x-to-8.x".
  * The next series of updates should start at 9000.
  */
@@ -2215,6 +2206,15 @@
 }
 
 /**
+ * Removes the drupal_js_cache_files variable.
+ *
+ * @ingroup config_upgrade
+ */
+function system_update_8032() {
+  update_variable_del('drupal_js_cache_files');
+}
+
+/**
  * @} End of "defgroup updates-7.x-to-8.x".
  * The next series of updates should start at 9000.
  */