diff --git a/MDErrorReporter.php b/MDErrorReporter.php
index 9f47309..9e980ae 100644
--- a/MDErrorReporter.php
+++ b/MDErrorReporter.php
@@ -54,15 +54,15 @@ final class MDErrorReporter {
      * Function human_filesize translates byte-level filesizes to human readable ones.
      * Thanks to Jeffrey Sambells http://jeffreysambells.com/2012/10/25/human-readable-filesize-php
      *
-     * @param string  $bytes    A file size, e.g. returned from filesize().
+     * @param integer $bytes    A file size, e.g. returned from filesize().
      * @param integer $decimals Number of decimal digits to allow.
      *
      * @return string
      */
-    public function human_filesize(string $bytes, int $decimals = 2):string {
+    public function human_filesize(int $bytes, int $decimals = 2):string {
 
         $size = ['B', 'kB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'];
-        $factor = \floor((strlen($bytes) - 1) / 3);
+        $factor = \floor((strlen((string)$bytes) - 1) / 3);
         return \sprintf("%.{$decimals}f", $bytes / \pow(1024, $factor)) . $size[$factor];
 
     }
@@ -121,10 +121,10 @@ final class MDErrorReporter {
     public function getAdditionalDebuggingInfo():array {
 
         $output = [
-            "Current memory usage" => $this->human_filesize((string)\memory_get_usage()),
-            "Peak memory usage" => $this->human_filesize((string)\memory_get_peak_usage()),
+            "Current memory usage" => $this->human_filesize(\memory_get_usage()),
+            "Peak memory usage" => $this->human_filesize(\memory_get_peak_usage()),
             "Included / required files" => \get_included_files(),
-            # "Allowed memory usage" => $this->human_filesize((string)ini_get("memory_limit")),
+            # "Allowed memory usage" => $this->human_filesize((int)ini_get("memory_limit")),
         ];
 
         return $output;