diff --git a/fdroidserver/metadata.py b/fdroidserver/metadata.py
index 8c8b384c..72737d41 100644
--- a/fdroidserver/metadata.py
+++ b/fdroidserver/metadata.py
@@ -446,7 +446,7 @@ valuetypes = {
                    ["ArchivePolicy"]),
 
     FieldValidator("Anti-Feature",
-                   r'^(Ads|Tracking|NonFreeNet|NonFreeDep|NonFreeAdd|UpstreamNonFree|NonFreeAssets|KnownVuln|ApplicationDebuggable|NoSourceSince|AdultContent)$',
+                   r'^(Ads|Tracking|NonFreeNet|NonFreeDep|NonFreeAdd|UpstreamNonFree|NonFreeAssets|KnownVuln|ApplicationDebuggable|NoSourceSince|NSFW)$',
                    ["AntiFeatures"]),
 
     FieldValidator("Auto Update Mode",