diff --git a/rules/DowngradePhp72/NodeManipulator/BitwiseFlagCleaner.php b/rules/DowngradePhp72/NodeManipulator/BitwiseFlagCleaner.php
index 9f966a4a..3e0e77d4 100644
--- a/rules/DowngradePhp72/NodeManipulator/BitwiseFlagCleaner.php
+++ b/rules/DowngradePhp72/NodeManipulator/BitwiseFlagCleaner.php
@@ -18,7 +18,7 @@ public function __construct(
     ) {
     }
 
-    public function cleanFuncCall(FuncCall $funcCall, BitwiseOr $bitwiseOr, string $flag, Expr $expr = null): void
+    public function cleanFuncCall(FuncCall $funcCall, BitwiseOr $bitwiseOr, string $flag, ?Expr $expr = null): void
     {
         if ($bitwiseOr->left instanceof BitwiseOr) {
             /** @var BitwiseOr $leftLeft */
diff --git a/src/PhpDocDecorator/PhpDocFromTypeDeclarationDecorator.php b/src/PhpDocDecorator/PhpDocFromTypeDeclarationDecorator.php
index d88576fd..a2cba62e 100644
--- a/src/PhpDocDecorator/PhpDocFromTypeDeclarationDecorator.php
+++ b/src/PhpDocDecorator/PhpDocFromTypeDeclarationDecorator.php
@@ -63,7 +63,7 @@ public function __construct(
 
     public function decorateReturn(ClassMethod|Function_|Closure|ArrowFunction $functionLike): void
     {
-        if ($functionLike->returnType === null) {
+        if (! $functionLike->returnType instanceof Node) {
             return;
         }
 
@@ -159,7 +159,7 @@ public function decorateReturnWithSpecificType(
         ClassMethod|Function_|Closure|ArrowFunction $functionLike,
         Type $requireType
     ): bool {
-        if ($functionLike->returnType === null) {
+        if (! $functionLike->returnType instanceof Node) {
             return false;
         }