diff --git a/conf/config.neon b/conf/config.neon
index 6c1a8d9ce6f..17b94482461 100644
--- a/conf/config.neon
+++ b/conf/config.neon
@@ -1176,14 +1176,14 @@ services:
 		tags:
 			- phpstan.broker.dynamicMethodReturnTypeExtension
 		arguments:
-			dateTimeClass: \DateTime
+			dateTimeClass: DateTime
 
 	-
 		class: PHPStan\Type\Php\DateTimeModifyReturnTypeExtension
 		tags:
 			- phpstan.broker.dynamicMethodReturnTypeExtension
 		arguments:
-			dateTimeClass: \DateTimeImmutable
+			dateTimeClass: DateTimeImmutable
 
 	-
 		class: PHPStan\Type\Php\DateTimeConstructorThrowTypeExtension