diff --git a/mycaldav/models.py b/mycaldav/models.py
index 9c7f7d9..7807aff 100644
--- a/mycaldav/models.py
+++ b/mycaldav/models.py
@@ -206,7 +206,7 @@ class cls_caldav():
                     item.key = item.key.replace("$","")
                 if "manif" in item.key.lower():
                     item.team_manif = True
-                    item.key = item.key.lower().replace("manif", "")
+                    item.key = item.key.lower().replace("manif", "").upper()
                 item.name = arr[1]
             if "&" in item.name:
                 arr = item.name.split("&")