diff --git a/Parsedown.php b/Parsedown.php
index d729740..0397431 100755
--- a/Parsedown.php
+++ b/Parsedown.php
@@ -32,8 +32,7 @@ class Parsedown
         $this->DefinitionData = array();
 
         # standardize line breaks
-        $text = str_replace("\r\n", "\n", $text);
-        $text = str_replace("\r", "\n", $text);
+        $text = str_replace(array("\r\n", "\r"), "\n", $text);
 
         # remove surrounding line breaks
         $text = trim($text, "\n");