diff --git a/Parsedown.php b/Parsedown.php
index 4e4449c..763199e 100755
--- a/Parsedown.php
+++ b/Parsedown.php
@@ -537,7 +537,7 @@ class Parsedown
 
         if ( ! isset($Block['interrupted']))
         {
-            $text = preg_replace('/^[ ]{0,2}/', '', $Line['body']);
+            $text = preg_replace('/^[ ]{0,4}/', '', $Line['body']);
 
             $Block['li']['text'] []= $text;
 
diff --git a/test/data/deeply_nested_list.md b/test/data/deeply_nested_list.md
index c761dc7..76b7552 100644
--- a/test/data/deeply_nested_list.md
+++ b/test/data/deeply_nested_list.md
@@ -1,6 +1,6 @@
 - li
-  - li
     - li
+        - li
+        - li
     - li
-  - li
 - li
\ No newline at end of file