diff --git a/src/Command/WorkerCommand.php b/src/Command/WorkerCommand.php
index e51aaa0d6b..e9a3042abe 100644
--- a/src/Command/WorkerCommand.php
+++ b/src/Command/WorkerCommand.php
@@ -103,6 +103,11 @@ protected function execute(InputInterface $input, OutputInterface $output): int
 		$loop = new StreamSelectLoop();
 
 		$container = $inceptionResult->getContainer();
+
+		/** @var NodeScopeResolver $nodeScopeResolver */
+		$nodeScopeResolver = $container->getByType(NodeScopeResolver::class);
+		$nodeScopeResolver->setAnalysedFiles($inceptionResult->getFiles());
+
 		$tcpConector = new TcpConnector($loop);
 		$tcpConector->connect(sprintf('127.0.0.1:%d', $port))->then(function (ConnectionInterface $connection) use ($container, $identifier): void {
 			$out = new Encoder($connection);
@@ -138,11 +143,8 @@ private function runWorker(Container $container, WritableStreamInterface $out, R
 		/** @var Registry $registry */
 		$registry = $container->getByType(Registry::class);
 
-		/** @var NodeScopeResolver $nodeScopeResolver */
-		$nodeScopeResolver = $container->getByType(NodeScopeResolver::class);
-
 		// todo collectErrors (from Analyser)
-		$in->on('data', static function (array $json) use ($fileAnalyser, $registry, $nodeScopeResolver, $out): void {
+		$in->on('data', static function (array $json) use ($fileAnalyser, $registry, $out): void {
 			$action = $json['action'];
 			if ($action !== 'analyse') {
 				return;
@@ -150,7 +152,6 @@ private function runWorker(Container $container, WritableStreamInterface $out, R
 
 			$internalErrorsCount = 0;
 			$files = $json['files'];
-			$nodeScopeResolver->setAnalysedFiles($files);
 			$errors = [];
 			$inferrablePropertyTypesFromConstructorHelper = new InferrablePropertyTypesFromConstructorHelper();
 			foreach ($files as $file) {
diff --git a/tests/PHPStan/Parallel/ParallelAnalyserIntegrationTest.php b/tests/PHPStan/Parallel/ParallelAnalyserIntegrationTest.php
new file mode 100644
index 0000000000..1c99f25c68
--- /dev/null
+++ b/tests/PHPStan/Parallel/ParallelAnalyserIntegrationTest.php
@@ -0,0 +1,63 @@
+<?php declare(strict_types = 1);
+
+namespace PHPStan\Parallel;
+
+use Nette\Utils\Json;
+use PHPUnit\Framework\TestCase;
+
+class ParallelAnalyserIntegrationTest extends TestCase
+{
+
+	public function testTraitsInDifferentJobAnalysed(): void
+	{
+		exec(sprintf(
+			'%s %s analyse -l 8 -c %s --error-format json %s',
+			escapeshellarg(PHP_BINARY),
+			escapeshellarg(__DIR__ . '/../../../bin/phpstan'),
+			escapeshellarg(__DIR__ . '/parallel-analyser.neon'),
+			implode(' ', array_map(static function (string $path): string {
+				return escapeshellarg($path);
+			}, [
+				__DIR__ . '/data/trait-definition.php',
+				__DIR__ . '/data/traits.php',
+			]))
+		), $outputLines, $exitCode);
+		$output = implode("\n", $outputLines);
+		$this->assertJsonStringEqualsJsonString(Json::encode([
+			'totals' => [
+				'errors' => 0,
+				'file_errors' => 3,
+			],
+			'files' => [
+				sprintf('%s/data/trait-definition.php (in context of class ParallelAnalyserIntegrationTest\\Bar)', __DIR__) => [
+					'errors' => 1,
+					'messages' => [
+						[
+							'message' => 'Method ParallelAnalyserIntegrationTest\\Bar::doFoo() has no return typehint specified.',
+							'line' => 8,
+							'ignorable' => true,
+						],
+					],
+				],
+				sprintf('%s/data/trait-definition.php (in context of class ParallelAnalyserIntegrationTest\\Foo)', __DIR__) => [
+					'errors' => 2,
+					'messages' => [
+						[
+							'message' => 'Method ParallelAnalyserIntegrationTest\\Foo::doFoo() has no return typehint specified.',
+							'line' => 8,
+							'ignorable' => true,
+						],
+						[
+							'message' => 'Access to an undefined property ParallelAnalyserIntegrationTest\\Foo::$test.',
+							'line' => 10,
+							'ignorable' => true,
+						],
+					],
+				],
+			],
+			'errors' => [],
+		]), $output);
+		$this->assertSame(1, $exitCode);
+	}
+
+}
diff --git a/tests/PHPStan/Parallel/data/trait-definition.php b/tests/PHPStan/Parallel/data/trait-definition.php
new file mode 100644
index 0000000000..edf01e73f8
--- /dev/null
+++ b/tests/PHPStan/Parallel/data/trait-definition.php
@@ -0,0 +1,13 @@
+<?php
+
+namespace ParallelAnalyserIntegrationTest;
+
+trait FooTrait
+{
+
+	public function doFoo()
+	{
+		$this->test = 1;
+	}
+
+}
diff --git a/tests/PHPStan/Parallel/data/traits.php b/tests/PHPStan/Parallel/data/traits.php
new file mode 100644
index 0000000000..402a344dd5
--- /dev/null
+++ b/tests/PHPStan/Parallel/data/traits.php
@@ -0,0 +1,20 @@
+<?php
+
+namespace ParallelAnalyserIntegrationTest;
+
+class Foo
+{
+
+	use FooTrait;
+
+}
+
+class Bar
+{
+
+	use FooTrait;
+
+	/** @var int */
+	private $test;
+
+}
diff --git a/tests/PHPStan/Parallel/parallel-analyser.neon b/tests/PHPStan/Parallel/parallel-analyser.neon
new file mode 100644
index 0000000000..9d61d8c7b9
--- /dev/null
+++ b/tests/PHPStan/Parallel/parallel-analyser.neon
@@ -0,0 +1,5 @@
+parameters:
+	featureToggles:
+		parallel: true
+	parallel:
+		jobSize: 1