diff --git a/src/fiber_package/membership_tag.py b/src/fiber_package/membership_tag.py
index 119e947..f42f2f9 100644
--- a/src/fiber_package/membership_tag.py
+++ b/src/fiber_package/membership_tag.py
@@ -14,7 +14,7 @@ def validate_visibility_tag(v: str) -> str:
     if v in BARE_TAGS:
         return v
     _, _, status = v.partition(":")
-    if status in MembershipType:
+    if status in Membership:
         return v
     raise ValueError(f"Invalid visibility tag: {v!r}")