diff --git a/src/unix/bsd/freebsdlike/freebsd/mod.rs b/src/unix/bsd/freebsdlike/freebsd/mod.rs
index 3c3e59b48b95..26a7d666547b 100644
--- a/src/unix/bsd/freebsdlike/freebsd/mod.rs
+++ b/src/unix/bsd/freebsdlike/freebsd/mod.rs
@@ -1645,7 +1645,7 @@ s_no_extra_traits! {
         pub kf_flags: ::c_int,
         _kf_pad0: ::c_int,
         pub kf_offset: i64,
-        _priv: [::uintptr_t; 38], // FIXME if needed
+        _priv: [u8; 304],   // FIXME: this is really a giant union
         pub kf_status: u16,
         _kf_pad1: u16,
         _kf_ispare0: ::c_int,