diff --git a/src/features.rs b/src/features.rs
index 9443069..e1f9dbe 100644
--- a/src/features.rs
+++ b/src/features.rs
@@ -1,13 +1,12 @@
 //! Feature Bits
 
 use crate::le128;
+use crate::sealed::Sealed;
 
 /// Feature Bits
 #[doc(alias = "VIRTIO_F")]
-pub trait FeatureBits: bitflags::Flags<Bits = le128>
-where
-    Self: From<F> + AsRef<F> + AsMut<F>,
-    F: From<Self> + AsRef<Self> + AsMut<Self>,
+pub trait FeatureBits:
+    bitflags::Flags<Bits = le128> + From<F> + Into<F> + AsRef<F> + AsMut<F> + Sealed
 {
     /// Returns the feature that this feature requires.
     ///
@@ -240,6 +239,8 @@ impl AsMut<F> for F {
 
 impl FeatureBits for F {}
 
+impl Sealed for F {}
+
 macro_rules! feature_bits {
     (
         $(#[$outer:meta])*
@@ -334,6 +335,8 @@ macro_rules! feature_bits {
             }
         }
 
+        impl $crate::sealed::Sealed for $BitFlags {}
+
         feature_bits! {
             $($t)*
         }
diff --git a/src/lib.rs b/src/lib.rs
index b7c3708..b4152af 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -109,6 +109,10 @@ pub mod pvirtq;
 pub mod virtq;
 pub mod vsock;
 
+mod sealed {
+    pub trait Sealed {}
+}
+
 pub use endian_num::{be128, be16, be32, be64, le128, le16, le32, le64, Be, Le};
 use num_enum::{FromPrimitive, IntoPrimitive, TryFromPrimitive};