diff --git a/src/Analyser/NodeScopeResolver.php b/src/Analyser/NodeScopeResolver.php
index f8cbcb4ff0..0d78ac8b14 100644
--- a/src/Analyser/NodeScopeResolver.php
+++ b/src/Analyser/NodeScopeResolver.php
@@ -503,6 +503,9 @@ private function processStmtNode(
 					if ($param->getDocComment() !== null) {
 						$phpDoc = $param->getDocComment()->getText();
 					}
+					if (!$scope->isInClass()) {
+						throw new ShouldNotHappenException();
+					}
 					$nodeCallback(new ClassPropertyNode(
 						$param->var->name,
 						$param->flags,
@@ -513,6 +516,7 @@ private function processStmtNode(
 						$param,
 						false,
 						$scope->isInTrait(),
+						$scope->getClassReflection()->isReadOnly(),
 					), $methodScope);
 				}
 			}
@@ -657,6 +661,9 @@ private function processStmtNode(
 			foreach ($stmt->props as $prop) {
 				$this->processStmtNode($prop, $scope, $nodeCallback);
 				[,,,,,,,,,,$isReadOnly, $docComment] = $this->getPhpDocs($scope, $stmt);
+				if (!$scope->isInClass()) {
+					throw new ShouldNotHappenException();
+				}
 				$nodeCallback(
 					new ClassPropertyNode(
 						$prop->name->toString(),
@@ -668,6 +675,7 @@ private function processStmtNode(
 						$prop,
 						$isReadOnly,
 						$scope->isInTrait(),
+						$scope->getClassReflection()->isReadOnly(),
 					),
 					$scope,
 				);
diff --git a/src/Node/ClassPropertyNode.php b/src/Node/ClassPropertyNode.php
index a7944ec834..42f47bba8b 100644
--- a/src/Node/ClassPropertyNode.php
+++ b/src/Node/ClassPropertyNode.php
@@ -23,6 +23,7 @@ public function __construct(
 		Node $originalNode,
 		private bool $isReadonlyByPhpDoc,
 		private bool $isDeclaredInTrait,
+		private bool $isReadonlyClass,
 	)
 	{
 		parent::__construct($originalNode->getAttributes());
@@ -76,7 +77,7 @@ public function isStatic(): bool
 
 	public function isReadOnly(): bool
 	{
-		return (bool) ($this->flags & Class_::MODIFIER_READONLY);
+		return (bool) ($this->flags & Class_::MODIFIER_READONLY) || $this->isReadonlyClass;
 	}
 
 	public function isReadOnlyByPhpDoc(): bool
diff --git a/src/Reflection/ClassReflection.php b/src/Reflection/ClassReflection.php
index 0e5f76a460..0bbe418ff5 100644
--- a/src/Reflection/ClassReflection.php
+++ b/src/Reflection/ClassReflection.php
@@ -584,6 +584,11 @@ public function isEnum(): bool
 		return $this->reflection->isEnum();
 	}
 
+	public function isReadOnly(): bool
+	{
+		return $this->reflection->isReadOnly();
+	}
+
 	public function isBackedEnum(): bool
 	{
 		if (!$this->reflection instanceof ReflectionEnum) {
diff --git a/tests/PHPStan/Rules/Properties/ReadOnlyPropertyRuleTest.php b/tests/PHPStan/Rules/Properties/ReadOnlyPropertyRuleTest.php
index c1e4dd90bf..51776a3dda 100644
--- a/tests/PHPStan/Rules/Properties/ReadOnlyPropertyRuleTest.php
+++ b/tests/PHPStan/Rules/Properties/ReadOnlyPropertyRuleTest.php
@@ -89,4 +89,14 @@ public function testRule(int $phpVersionId, array $errors): void
 		$this->analyse([__DIR__ . '/data/read-only-property.php'], $errors);
 	}
 
+	/**
+	 * @dataProvider dataRule
+	 * @param mixed[] $errors
+	 */
+	public function testRuleReadonlyClass(int $phpVersionId, array $errors): void
+	{
+		$this->phpVersionId = $phpVersionId;
+		$this->analyse([__DIR__ . '/data/read-only-property-readonly-class.php'], $errors);
+	}
+
 }
diff --git a/tests/PHPStan/Rules/Properties/data/read-only-property-readonly-class.php b/tests/PHPStan/Rules/Properties/data/read-only-property-readonly-class.php
new file mode 100644
index 0000000000..1c3a6dae11
--- /dev/null
+++ b/tests/PHPStan/Rules/Properties/data/read-only-property-readonly-class.php
@@ -0,0 +1,24 @@
+<?php // lint >= 8.2
+
+namespace ReadOnlyPropertyReadonlyClass;
+
+readonly class Foo
+{
+
+	private int $foo;
+	private $bar;
+	private int $baz = 0;
+
+}
+
+readonly final class ErrorResponse
+{
+	public function __construct(public string $message = '')
+	{
+	}
+}
+
+readonly class StaticReadonlyProperty
+{
+	private static int $foo;
+}