diff --git a/src/Corpus.zig b/src/Corpus.zig
index 29397fe..1266627 100644
--- a/src/Corpus.zig
+++ b/src/Corpus.zig
@@ -173,8 +173,8 @@ pub fn init(
                 // nss implementation does.
                 // - Uncomment this code to behave how Classics behave.
                 // - Leave commented to be compatible with Ours Truly NSS.
-                //if (users.items(.gid)[user_idx] == groups.items(.gid)[i])
-                //    continue;
+                if (users.items(.gid)[user_idx] == groups.items(.gid)[i])
+                    continue;
                 members.len += 1;
                 members[members.len - 1] = user_idx;
                 try user2groups[user_idx].append(allocator, @intCast(u32, i));