diff --git a/phpstan-baseline.neon b/phpstan-baseline.neon
index f5f73b8a..622e1283 100644
--- a/phpstan-baseline.neon
+++ b/phpstan-baseline.neon
@@ -20,6 +20,16 @@ parameters:
 			count: 1
 			path: src/Rules/Doctrine/ORM/EntityRelationRule.php
 
+		-
+			message: "#^Class Doctrine\\\\ORM\\\\Mapping\\\\FieldMapping not found\\.$#"
+			count: 1
+			path: src/Rules/Doctrine/ORM/PropertiesExtension.php
+
+		-
+			message: "#^Instanceof between array\\<string, array\\<string, mixed\\>\\|bool\\|int\\|string\\> and Doctrine\\\\ORM\\\\Mapping\\\\FieldMapping will always evaluate to false\\.$#"
+			count: 1
+			path: src/Rules/Doctrine/ORM/PropertiesExtension.php
+
 		-
 			message: "#^PHPDoc tag @var with type class\\-string is not subtype of native type 'Doctrine\\\\\\\\Bundle…'\\.$#"
 			count: 1
diff --git a/src/Rules/Doctrine/ORM/PropertiesExtension.php b/src/Rules/Doctrine/ORM/PropertiesExtension.php
index d9accb80..177b4ebd 100644
--- a/src/Rules/Doctrine/ORM/PropertiesExtension.php
+++ b/src/Rules/Doctrine/ORM/PropertiesExtension.php
@@ -3,11 +3,11 @@
 namespace PHPStan\Rules\Doctrine\ORM;
 
 use Doctrine\ORM\Mapping\ClassMetadata;
+use Doctrine\ORM\Mapping\FieldMapping;
 use PHPStan\Reflection\PropertyReflection;
 use PHPStan\Rules\Properties\ReadWritePropertiesExtension;
 use PHPStan\Type\Doctrine\ObjectMetadataResolver;
 use Throwable;
-use function array_key_exists;
 use function in_array;
 
 class PropertiesExtension implements ReadWritePropertiesExtension
@@ -47,7 +47,16 @@ public function isAlwaysWritten(PropertyReflection $property, string $propertyNa
 
 		if (isset($metadata->fieldMappings[$propertyName])) {
 			$mapping = $metadata->fieldMappings[$propertyName];
-			if (array_key_exists('generated', $mapping) && $mapping['generated'] !== ClassMetadata::GENERATED_NEVER) {
+
+			if ($mapping instanceof FieldMapping) {
+				// ORM 3
+				$generated = $mapping->generated;
+			} else {
+				// ORM 2
+				$generated = $mapping['generated'] ?? null;
+			}
+
+			if ($generated !== null && $generated !== ClassMetadata::GENERATED_NEVER) {
 				return true;
 			}
 		}