diff --git a/src/PhpParserReflector/ContextualPhpParserReflector.php b/src/PhpParserReflector/ContextualPhpParserReflector.php
index 251ad78..e8d6470 100644
--- a/src/PhpParserReflector/ContextualPhpParserReflector.php
+++ b/src/PhpParserReflector/ContextualPhpParserReflector.php
@@ -175,7 +175,11 @@ private function reflectClassModifiers(Stmt\ClassLike $node): int
         $modifiers = ($node->isAbstract() ? ClassReflection::IS_EXPLICIT_ABSTRACT : 0)
             + ($node->isFinal() ? ClassReflection::IS_FINAL : 0);
 
-        if (defined(\ReflectionClass::class.'::IS_READONLY') && $node->isReadonly()) {
+        if (\defined(\ReflectionClass::class . '::IS_READONLY') && $node->isReadonly()) {
+            /**
+             * @var int-mask-of<\ReflectionClass::IS_*>
+             * @psalm-suppress MixedOperand, UnusedPsalmSuppress
+             */
             $modifiers += \ReflectionClass::IS_READONLY;
         }