diff --git a/src/Command/FixerApplication.php b/src/Command/FixerApplication.php
index 72a7263d15..de0a04ec24 100644
--- a/src/Command/FixerApplication.php
+++ b/src/Command/FixerApplication.php
@@ -145,8 +145,8 @@ public function log(string $message): void
 		);
 
 		$server->on('connection', function (ConnectionInterface $connection) use ($loop, $projectConfigFile, $input, $output, $fileSpecificErrors, $notFileSpecificErrors, $mainScript, $filesCount, $reanalyseProcessQueue, $inceptionResult): void {
-			$decoder = new Decoder($connection, true, 512, 0, 128 * 1024 * 1024);
-			$encoder = new Encoder($connection);
+			$decoder = new Decoder($connection, true, 512, defined('JSON_INVALID_UTF8_IGNORE') ? JSON_INVALID_UTF8_IGNORE : 0, 128 * 1024 * 1024);
+			$encoder = new Encoder($connection, defined('JSON_INVALID_UTF8_IGNORE') ? JSON_INVALID_UTF8_IGNORE : 0);
 			$encoder->write(['action' => 'initialData', 'data' => [
 				'fileSpecificErrors' => $fileSpecificErrors,
 				'notFileSpecificErrors' => $notFileSpecificErrors,
diff --git a/src/Command/WorkerCommand.php b/src/Command/WorkerCommand.php
index 185afdf07e..35f08d6d94 100644
--- a/src/Command/WorkerCommand.php
+++ b/src/Command/WorkerCommand.php
@@ -136,8 +136,8 @@ protected function execute(InputInterface $input, OutputInterface $output): int
 
 		$tcpConector = new TcpConnector($loop);
 		$tcpConector->connect(sprintf('127.0.0.1:%d', $port))->done(function (ConnectionInterface $connection) use ($container, $identifier, $output, $analysedFiles, $tmpFile, $insteadOfFile): void {
-			$out = new Encoder($connection);
-			$in = new Decoder($connection, true, 512, 0, $container->getParameter('parallel')['buffer']);
+			$out = new Encoder($connection, defined('JSON_INVALID_UTF8_IGNORE') ? JSON_INVALID_UTF8_IGNORE : 0);
+			$in = new Decoder($connection, true, 512, defined('JSON_INVALID_UTF8_IGNORE') ? JSON_INVALID_UTF8_IGNORE : 0, $container->getParameter('parallel')['buffer']);
 			$out->write(['action' => 'hello', 'identifier' => $identifier]);
 			$this->runWorker($container, $out, $in, $output, $analysedFiles, $tmpFile, $insteadOfFile);
 		});
diff --git a/src/Parallel/ParallelAnalyser.php b/src/Parallel/ParallelAnalyser.php
index 7160e10716..89fdb88654 100644
--- a/src/Parallel/ParallelAnalyser.php
+++ b/src/Parallel/ParallelAnalyser.php
@@ -65,8 +65,8 @@ public function analyse(
 		$server = new \React\Socket\TcpServer('127.0.0.1:0', $loop);
 		$this->processPool = new ProcessPool($server);
 		$server->on('connection', function (ConnectionInterface $connection) use (&$jobs): void {
-			$decoder = new Decoder($connection, true, 512, 0, $this->decoderBufferSize);
-			$encoder = new Encoder($connection);
+			$decoder = new Decoder($connection, true, 512, defined('JSON_INVALID_UTF8_IGNORE') ? JSON_INVALID_UTF8_IGNORE : 0, $this->decoderBufferSize);
+			$encoder = new Encoder($connection, defined('JSON_INVALID_UTF8_IGNORE') ? JSON_INVALID_UTF8_IGNORE : 0);
 			$decoder->on('data', function (array $data) use (&$jobs, $decoder, $encoder): void {
 				if ($data['action'] !== 'hello') {
 					return;