diff --git a/core/modules/system/system.install b/core/modules/system/system.install
index 68a533ae30..fb3d5eac82 100644
--- a/core/modules/system/system.install
+++ b/core/modules/system/system.install
@@ -1237,3 +1237,11 @@ function system_schema() {
 function system_update_last_removed() {
   return 8805;
 }
+
+/**
+ * Ensures that Drupal is updated from a supported version.
+ */
+function system_update_9000() {
+  // See update_get_update_list(), there needs to be at least one update
+  // function to check for the last removed schema version.
+}