diff -u b/core/lib/Drupal/Core/Config/ConfigImporter.php b/core/lib/Drupal/Core/Config/ConfigImporter.php
--- b/core/lib/Drupal/Core/Config/ConfigImporter.php
+++ b/core/lib/Drupal/Core/Config/ConfigImporter.php
@@ -217,9 +217,9 @@
       $this->validate();
 
       $this->configFactory->enterContext($this->context);
-      if (!$this->lock->acquire($this::SERVICE_NAME)) {
+      if (!$this->lock->acquire(static::SERVICE_NAME)) {
         // Another process is synchronizing configuration.
-        throw new ConfigImporterException(sprintf('Import service %s is already running', $this::SERVICE_NAME));
+        throw new ConfigImporterException(sprintf('Import service %s is already running', static::SERVICE_NAME));
       }
       $this->importInvokeOwner();
       $this->importConfig();
@@ -227,7 +227,7 @@
       $this->notify('import');
 
       // The import is now complete.
-      $this->lock->release($this::SERVICE_NAME);
+      $this->lock->release(static::SERVICE_NAME);
       $this->reset();
       // Leave the context used during import and clear the ConfigFactory's
       // static cache.
@@ -315,7 +315,7 @@
    *   The name of the config importer event to dispatch.
    */
   protected function notify($event_name) {
-    $this->eventDispatcher->dispatch($this::SERVICE_NAME . '.' . $event_name, new ConfigImporterEvent($this));
+    $this->eventDispatcher->dispatch(static::SERVICE_NAME . '.' . $event_name, new ConfigImporterEvent($this));
   }
 
   /**
@@ -325,7 +325,7 @@
    *   TRUE if an import is already running, FALSE if not.
    */
   public function alreadyImporting() {
-    return !$this->lock->lockMayBeAvailable($this::SERVICE_NAME);
+    return !$this->lock->lockMayBeAvailable(static::SERVICE_NAME);
   }
 
   /**
@@ -335,7 +335,7 @@
    *   The service name.
    */
   public function getServiceName() {
-    return $this::SERVICE_NAME;
+    return static::SERVICE_NAME;
   }
 
 }