diff --git a/samples/01_Simple_download_pdf.php b/samples/01_Simple_download_pdf.php
index 67111fb0..dc23daa0 100644
--- a/samples/01_Simple_download_pdf.php
+++ b/samples/01_Simple_download_pdf.php
@@ -53,6 +53,6 @@ header('Content-Type: application/pdf');
 header('Content-Disposition: attachment;filename="01simple.pdf"');
 header('Cache-Control: max-age=0');
 
-$writer = \PhpOffice\PhpSpreadsheet\IOFactory::createWriter($spreadsheet, 'PDF');
+$writer = \PhpOffice\PhpSpreadsheet\IOFactory::createWriter($spreadsheet, 'Pdf');
 $writer->save('php://output');
 exit;
diff --git a/samples/32_Chart_read_write_PDF.php b/samples/32_Chart_read_write_PDF.php
index 8d895d43..d41f6728 100644
--- a/samples/32_Chart_read_write_PDF.php
+++ b/samples/32_Chart_read_write_PDF.php
@@ -91,7 +91,7 @@ foreach ($inputFileNames as $inputFileName) {
 
     // Save
     $filename = $helper->getFilename($inputFileName);
-    $writer = \PhpOffice\PhpSpreadsheet\IOFactory::createWriter($spreadsheet, 'PDF');
+    $writer = \PhpOffice\PhpSpreadsheet\IOFactory::createWriter($spreadsheet, 'Pdf');
     $writer->setIncludeCharts(true);
     $callStartTime = microtime(true);
     $writer->save($filename);