diff --git a/markdown.php b/markdown.php
index dbbb45b..94b4724 100644
--- a/markdown.php
+++ b/markdown.php
@@ -16,7 +16,8 @@ class markdown
       @param string $mark Message in markdown syntax to display */
   public function html ($mark)
   {
-    if ($this->debug) unlink ("/tmp/debug");
+    if ($this->debug && file_exists ("/tmp/debugMD"))
+      unlink ("/tmp/debugMD");
     $res = "";
     $mark = htmlentities ($mark, ENT_QUOTES);