diff --git a/Parsedown.php b/Parsedown.php
index a109451..e9a8cbd 100755
--- a/Parsedown.php
+++ b/Parsedown.php
@@ -279,7 +279,7 @@ class Parsedown
 
             $Block = array(
                 'element' => array(
-                    'name' => 'h'.$level,
+                    'name' => 'h' . min(6, $level),
                     'text' => $text,
                     'handler' => 'line',
                 ),
diff --git a/test/data/atx_heading.html b/test/data/atx_heading.html
index 22d865d..3ab3fd5 100644
--- a/test/data/atx_heading.html
+++ b/test/data/atx_heading.html
@@ -4,5 +4,6 @@
 <h4>h4</h4>
 <h5>h5</h5>
 <h6>h6</h6>
+<h6>h6</h6>
 <h1>closed h1</h1>
 <p>#</p>
\ No newline at end of file
diff --git a/test/data/atx_heading.md b/test/data/atx_heading.md
index 039baaa..5339a5b 100644
--- a/test/data/atx_heading.md
+++ b/test/data/atx_heading.md
@@ -10,6 +10,8 @@
 
 ###### h6
 
+####### h6
+
 # closed h1 #
 
 #
\ No newline at end of file