diff --git a/core/modules/migrate/src/MemoryManager.php b/core/modules/migrate/src/MemoryManager.php
index 515979d36d..ac01e79677 100644
--- a/core/modules/migrate/src/MemoryManager.php
+++ b/core/modules/migrate/src/MemoryManager.php
@@ -77,12 +77,12 @@ public function __construct(EventDispatcherInterface $dispatcher, $reclaim_thres
    */
   public function ensureMemory() {
     if ($this->isLimitExceeded()) {
-      $event = new MigrateMemoryLimitEvent($this->getUsageRatio(), $this->getUsageInBytes(), $this->getLimit(), MemoryManagerInterface::PRE_RECLAIMED);
+      $event = new MigrateMemoryLimitEvent($this->getUsageRatio(), $this->getUsageInBytes(), $this->getLimit(), self::PRE_RECLAIMED);
       $this->dispatcher->dispatch(MigrateEvents::MEMORY_LIMIT, $event);
       // Re-check the reclaim threshold to ensure we reclaimed enough to
       // continue.
       if ($this->isLimitExceeded($this->memoryReclaimThreshold)) {
-        $event = new MigrateMemoryLimitEvent($this->getUsageRatio(), $this->getUsageInBytes(), $this->getLimit(), MemoryManagerInterface::STILL_EXCEEDED);
+        $event = new MigrateMemoryLimitEvent($this->getUsageRatio(), $this->getUsageInBytes(), $this->getLimit(), self::STILL_EXCEEDED);
         $this->dispatcher->dispatch(MigrateEvents::MEMORY_LIMIT, $event);
         return FALSE;
       }