diff --git a/src/Detector/PngDetector.php b/src/Detector/PngDetector.php
index d21c841..0ef5869 100644
--- a/src/Detector/PngDetector.php
+++ b/src/Detector/PngDetector.php
@@ -21,6 +21,6 @@ final class PngDetector implements DetectorInterface
      */
     public function detect(SplFileObject $file): ?ImageType
     {
-        return$file->fread(4) === chr(0x89) . 'PNG' ? new ImageType(ImageFormat::PNG, MimeType::IMAGE_PNG) : null;
+        return $file->fread(4) === chr(0x89) . 'PNG' ? new ImageType(ImageFormat::PNG, MimeType::IMAGE_PNG) : null;
     }
 }