diff --git a/radicale/ical.py b/radicale/ical.py
index 09332a0..a20f044 100644
--- a/radicale/ical.py
+++ b/radicale/ical.py
@@ -52,7 +52,7 @@ def serialize(headers=(), items=()):
     for part in (headers, items):
         if part:
             lines.append("\n".join(item.text for item in part))
-    lines.append("END:VCALENDAR")
+    lines.append("END:VCALENDAR\n")
     return "\n".join(lines)