diff --git a/src/Rules/DeadCode/UnusedPrivateConstantRule.php b/src/Rules/DeadCode/UnusedPrivateConstantRule.php
index 024cbbf322..504a0cb616 100644
--- a/src/Rules/DeadCode/UnusedPrivateConstantRule.php
+++ b/src/Rules/DeadCode/UnusedPrivateConstantRule.php
@@ -8,6 +8,7 @@
 use PHPStan\Rules\Constants\AlwaysUsedClassConstantsExtensionProvider;
 use PHPStan\Rules\Rule;
 use PHPStan\Rules\RuleErrorBuilder;
+use PHPStan\Type\ObjectType;
 use function sprintf;
 
 /**
@@ -32,6 +33,7 @@ public function processNode(Node $node, Scope $scope): array
 		}
 
 		$classReflection = $node->getClassReflection();
+		$classType = new ObjectType($classReflection->getName());
 
 		$constants = [];
 		foreach ($node->getConstants() as $constant) {
@@ -68,10 +70,16 @@ public function processNode(Node $node, Scope $scope): array
 
 			$constantReflection = $fetchScope->getConstantReflection($fetchedOnClass, $fetchNode->name->toString());
 			if ($constantReflection === null) {
+				if (!$classType->isSuperTypeOf($fetchedOnClass)->no()) {
+					unset($constants[$fetchNode->name->toString()]);
+				}
 				continue;
 			}
 
 			if ($constantReflection->getDeclaringClass()->getName() !== $classReflection->getName()) {
+				if (!$classType->isSuperTypeOf($fetchedOnClass)->no()) {
+					unset($constants[$fetchNode->name->toString()]);
+				}
 				continue;
 			}
 
diff --git a/src/Rules/DeadCode/UnusedPrivateMethodRule.php b/src/Rules/DeadCode/UnusedPrivateMethodRule.php
index 83d2f2313f..df805f3731 100644
--- a/src/Rules/DeadCode/UnusedPrivateMethodRule.php
+++ b/src/Rules/DeadCode/UnusedPrivateMethodRule.php
@@ -10,6 +10,7 @@
 use PHPStan\Rules\Rule;
 use PHPStan\Rules\RuleErrorBuilder;
 use PHPStan\Type\Constant\ConstantStringType;
+use PHPStan\Type\ObjectType;
 use function array_map;
 use function count;
 use function sprintf;
@@ -32,6 +33,7 @@ public function processNode(Node $node, Scope $scope): array
 			return [];
 		}
 		$classReflection = $node->getClassReflection();
+		$classType = new ObjectType($classReflection->getName());
 		$constructor = null;
 		if ($classReflection->hasConstructor()) {
 			$constructor = $classReflection->getConstructor();
@@ -93,9 +95,15 @@ public function processNode(Node $node, Scope $scope): array
 			foreach ($methodNames as $methodName) {
 				$methodReflection = $callScope->getMethodReflection($calledOnType, $methodName);
 				if ($methodReflection === null) {
+					if (!$classType->isSuperTypeOf($calledOnType)->no()) {
+						unset($methods[strtolower($methodName)]);
+					}
 					continue;
 				}
 				if ($methodReflection->getDeclaringClass()->getName() !== $classReflection->getName()) {
+					if (!$classType->isSuperTypeOf($calledOnType)->no()) {
+						unset($methods[strtolower($methodName)]);
+					}
 					continue;
 				}
 				if ($inMethod->getName() === $methodName) {
diff --git a/src/Rules/DeadCode/UnusedPrivatePropertyRule.php b/src/Rules/DeadCode/UnusedPrivatePropertyRule.php
index 98da6a68ed..2678b2e42b 100644
--- a/src/Rules/DeadCode/UnusedPrivatePropertyRule.php
+++ b/src/Rules/DeadCode/UnusedPrivatePropertyRule.php
@@ -10,6 +10,7 @@
 use PHPStan\Rules\Rule;
 use PHPStan\Rules\RuleErrorBuilder;
 use PHPStan\Type\Constant\ConstantStringType;
+use PHPStan\Type\ObjectType;
 use function array_key_exists;
 use function array_map;
 use function count;
@@ -46,6 +47,7 @@ public function processNode(Node $node, Scope $scope): array
 			return [];
 		}
 		$classReflection = $node->getClassReflection();
+		$classType = new ObjectType($classReflection->getName());
 		$properties = [];
 		foreach ($node->getProperties() as $property) {
 			if (!$property->isPrivate()) {
@@ -139,9 +141,23 @@ public function processNode(Node $node, Scope $scope): array
 				}
 				$propertyReflection = $usage->getScope()->getPropertyReflection($fetchedOnType, $propertyName);
 				if ($propertyReflection === null) {
+					if (!$classType->isSuperTypeOf($fetchedOnType)->no()) {
+						if ($usage instanceof PropertyRead) {
+							$properties[$propertyName]['read'] = true;
+						} else {
+							$properties[$propertyName]['written'] = true;
+						}
+					}
 					continue;
 				}
 				if ($propertyReflection->getDeclaringClass()->getName() !== $classReflection->getName()) {
+					if (!$classType->isSuperTypeOf($fetchedOnType)->no()) {
+						if ($usage instanceof PropertyRead) {
+							$properties[$propertyName]['read'] = true;
+						} else {
+							$properties[$propertyName]['written'] = true;
+						}
+					}
 					continue;
 				}
 
diff --git a/tests/PHPStan/Rules/DeadCode/UnusedPrivateConstantRuleTest.php b/tests/PHPStan/Rules/DeadCode/UnusedPrivateConstantRuleTest.php
index 73076bf285..f4940f2af3 100644
--- a/tests/PHPStan/Rules/DeadCode/UnusedPrivateConstantRuleTest.php
+++ b/tests/PHPStan/Rules/DeadCode/UnusedPrivateConstantRuleTest.php
@@ -92,4 +92,9 @@ public function testBug9005(): void
 		$this->analyse([__DIR__ . '/data/bug-9005.php'], []);
 	}
 
+	public function testBug9765(): void
+	{
+		$this->analyse([__DIR__ . '/data/bug-9765.php'], []);
+	}
+
 }
diff --git a/tests/PHPStan/Rules/DeadCode/UnusedPrivateMethodRuleTest.php b/tests/PHPStan/Rules/DeadCode/UnusedPrivateMethodRuleTest.php
index ac7ff6d7cb..83a1e8ef83 100644
--- a/tests/PHPStan/Rules/DeadCode/UnusedPrivateMethodRuleTest.php
+++ b/tests/PHPStan/Rules/DeadCode/UnusedPrivateMethodRuleTest.php
@@ -109,4 +109,9 @@ public function testBug6039(): void
 		$this->analyse([__DIR__ . '/data/bug-6039.php'], []);
 	}
 
+	public function testBug9765(): void
+	{
+		$this->analyse([__DIR__ . '/data/bug-9765.php'], []);
+	}
+
 }
diff --git a/tests/PHPStan/Rules/DeadCode/UnusedPrivatePropertyRuleTest.php b/tests/PHPStan/Rules/DeadCode/UnusedPrivatePropertyRuleTest.php
index f93caea9f0..dbabf5526c 100644
--- a/tests/PHPStan/Rules/DeadCode/UnusedPrivatePropertyRuleTest.php
+++ b/tests/PHPStan/Rules/DeadCode/UnusedPrivatePropertyRuleTest.php
@@ -286,4 +286,11 @@ public function testBug9409(): void
 		$this->analyse([__DIR__ . '/data/bug-9409.php'], []);
 	}
 
+	public function testBug9765(): void
+	{
+		$this->alwaysWrittenTags = [];
+		$this->alwaysReadTags = [];
+		$this->analyse([__DIR__ . '/data/bug-9765.php'], []);
+	}
+
 }
diff --git a/tests/PHPStan/Rules/DeadCode/data/bug-9765.php b/tests/PHPStan/Rules/DeadCode/data/bug-9765.php
new file mode 100644
index 0000000000..10fbbcf45d
--- /dev/null
+++ b/tests/PHPStan/Rules/DeadCode/data/bug-9765.php
@@ -0,0 +1,71 @@
+<?php declare(strict_types = 1);
+
+namespace Bug9765;
+
+class HelloWorld
+{
+
+	public static function runner(): \Closure
+	{
+		return function (int $arg) {
+			return $this->add($arg);
+		};
+	}
+
+	public function do(): void
+	{
+		$c = self::runner();
+		print $c->bindTo($this)(5);
+	}
+
+	private function add(int $a): int
+	{
+		return $a + 1;
+	}
+
+}
+
+class HelloWorld2
+{
+
+	/** @var int */
+	private $foo;
+
+	public static function runner(): \Closure
+	{
+		return function (int $arg) {
+			if ($arg > 0) {
+				$this->foo = $arg;
+			} else {
+				echo $this->foo;
+			}
+		};
+	}
+
+	public function do(): void
+	{
+		$c = self::runner();
+		print $c->bindTo($this)(5);
+	}
+
+}
+
+class HelloWorld3
+{
+
+	private const FOO = 1;
+
+	public static function runner(): \Closure
+	{
+		return function (int $arg) {
+			echo $this::FOO;
+		};
+	}
+
+	public function do(): void
+	{
+		$c = self::runner();
+		print $c->bindTo($this)(5);
+	}
+
+}