diff --git a/inc/Service/Media/CmdMagickImageMetadataReader.php b/inc/Service/Media/CmdMagickImageMetadataReader.php
index 730c6a65..80b74e1e 100644
--- a/inc/Service/Media/CmdMagickImageMetadataReader.php
+++ b/inc/Service/Media/CmdMagickImageMetadataReader.php
@@ -52,11 +52,11 @@ class CmdMagickImageMetadataReader implements ImageMetadataReader {
 		$ret_exec = shell_exec_error("{$this->prefix} identify -format \"%w %h %m\" $arg");
 
 		if (!\is_string($ret_exec)) {
-			throw new \RuntimeException("Error while executing identify");
+			throw new \RuntimeException('Error while executing identify');
 		}
 		$ret_match = \preg_match('/^(\d+) (\d+) ([\w\d]+) ([\w]+)$/', $ret_exec, $m);
 		if (!$ret_match) {
-			throw new \RuntimeException("Could not parse identify output");
+			throw new \RuntimeException('Could not parse identify output');
 		}
 		$width = $m[1];
 		$height = $m[2];