diff --git a/vdirsyncer/vobject.py b/vdirsyncer/vobject.py
index 5148221..8fdb2ab 100644
--- a/vdirsyncer/vobject.py
+++ b/vdirsyncer/vobject.py
@@ -329,7 +329,7 @@ class _Component:
                 break
 
             for line in lineiter:
-                if not line.startswith((" ", "\t")):
+                if not line.startswith((" ", "\t", *prefix)):
                     new_lines.append(line)
                     break