diff --git a/main.py b/main.py
index 5543c7e..36b3028 100644
--- a/main.py
+++ b/main.py
@@ -120,7 +120,7 @@ class MyHTMLParser(HTMLParser):
                 if line.strip().startswith('# '):
                     if header == line.strip():
                         continue
-                    header = line
+                    header = line.strip()
 
                 # Add a `\n` if line is a heading.
                 if line.startswith('#'):