diff --git a/ParsedownCheckbox.php b/ParsedownCheckbox.php
index b036d15..886d77a 100644
--- a/ParsedownCheckbox.php
+++ b/ParsedownCheckbox.php
@@ -39,10 +39,10 @@ class ParsedownCheckbox extends ParsedownExtra
             for ($iterator_text = 0; $iterator_text < $count_text; $iterator_text++) {
                 $begin_line = substr(trim($block['element']['text'][$iterator_element]['text'][$iterator_text]), 0, 4);
                 if ('[ ] ' === $begin_line) {
-                    $block['element']['text'][$iterator_element]['text'][$iterator_text] = '<input type="checkbox" /> '.
+                    $block['element']['text'][$iterator_element]['text'][$iterator_text] = '<input type="checkbox" disabled /> '.
                         substr(trim($block['element']['text'][$iterator_element]['text'][$iterator_text]), 4);
                 } elseif ('[x] ' === $begin_line) {
-                    $block['element']['text'][$iterator_element]['text'][$iterator_text] = '<input type="checkbox" checked /> '.
+                    $block['element']['text'][$iterator_element]['text'][$iterator_text] = '<input type="checkbox" checked disabled /> '.
                         substr(trim($block['element']['text'][$iterator_element]['text'][$iterator_text]), 4);
                 }
             }
diff --git a/test/ParsedownCheckboxTest.php b/test/ParsedownCheckboxTest.php
index 2ce2121..9c7f594 100644
--- a/test/ParsedownCheckboxTest.php
+++ b/test/ParsedownCheckboxTest.php
@@ -16,12 +16,12 @@ EOF;
 
         $html = <<<EOF
 <ul>
-<li><input type="checkbox" /> test 1</li>
+<li><input type="checkbox" disabled /> test 1</li>
 <li>[] test 2</li>
-<li><input type="checkbox" checked /> test 3
+<li><input type="checkbox" checked disabled /> test 3
 <ul>
-<li><input type="checkbox" /> test 4</li>
-<li><input type="checkbox" checked /> test 5</li>
+<li><input type="checkbox" disabled /> test 4</li>
+<li><input type="checkbox" checked disabled /> test 5</li>
 </ul></li>
 <li><a href="https://markdown.org">test</a> 6</li>
 <li><a href="https://markdown.org">x</a> test 7</li>