diff --git a/src/EntityManager.php b/src/EntityManager.php
index 79c18f4..7d512a2 100644
--- a/src/EntityManager.php
+++ b/src/EntityManager.php
@@ -34,7 +34,7 @@ public function getWrappedEm() : EntityManagerInterface
             /** @psalm-var EntityManagerInterface */
             $context[self::class] = ($this->emCreatorFn)();
             /** @psalm-suppress MixedMethodCall */
-            Co::defer(function () use ($context) {
+            Co::defer(static function () use ($context) {
                 $context[self::class]->close();
                 unset($context[self::class]);
             });