diff --git a/src/lib.rs b/src/lib.rs
index e048f871b8..d5025a5504 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -644,16 +644,31 @@ pub type Result<T> = std::result::Result<T, Status>;
 
 ////////////////////////
 
+/// A common implementation of the sealed supertrait programming pattern 
+/// (C-SEALED)
+/// 
+/// With this, implementations of `Sealed` are guarenteed to only exist in the
+/// current crate. This allows modifictation of the underyling traits in ways
+/// that would ordinarily be a breaking change for traits that are not sealed.
+/// 
+/// See https://rust-lang.github.io/api-guidelines/future-proofing.html#sealed-traits-protect-against-downstream-implementations-c-sealed
+ 
+mod private {
+    pub trait Sealed {}
+    
+    impl <T> Sealed for T{}
+}
+
 /// A Rust type that maps to a `DataType`.
 ///
 /// Currently, all implementors must *not* implement Drop (or transitively contain
 /// anything that does) and must be bit-for-bit compatible with the corresponding C
-/// type. Clients must not implement this trait.
+/// type. Clients cannot implement this trait.
 ///
 /// This trait doesn't require `num::Zero` or `num::One` because some tensor
 /// types (such as `bool` and `String`) don't implement them and we need to
 /// supply custom implementations.
-pub trait TensorType: Default + Clone + Display + Debug + 'static {
+pub trait TensorType: private::Sealed + Default + Clone + Display + Debug + 'static {
     /// Internal only; do not use outside of the tensorflow crate.
     ///
     /// Tensor representation for this type. Normally `TensorDataCRepr` for types