diff --git a/implementations/rust/preserves/src/lib.rs b/implementations/rust/preserves/src/lib.rs
index 38aeb2e..8d65a80 100644
--- a/implementations/rust/preserves/src/lib.rs
+++ b/implementations/rust/preserves/src/lib.rs
@@ -21,7 +21,7 @@ mod dom {
 
     fn dom_as_preserves(v: &Dom) -> io::Result<UnwrappedIOValue> {
         Ok(match v {
-            Dom::One => Value::ByteString(vec![255, 255, 255, 255]),
+            Dom::One => Value::bytestring(vec![255, 255, 255, 255]),
             Dom::Two => Value::symbol(&format!("Dom::{:?}", v)),
         })
     }
diff --git a/implementations/rust/preserves/src/value/repr.rs b/implementations/rust/preserves/src/value/repr.rs
index 88e8034..7e90787 100644
--- a/implementations/rust/preserves/src/value/repr.rs
+++ b/implementations/rust/preserves/src/value/repr.rs
@@ -39,6 +39,10 @@ pub trait NestedValue<D: Embeddable>: Sized + Debug + Clone + Eq + Hash + Ord {
         Value::symbol(n).wrap()
     }
 
+    fn bytestring<'a, V: Into<Cow<'a, [u8]>>>(v: V) -> Self {
+        Value::bytestring(v).wrap()
+    }
+
     fn wrap(anns: Annotations<Self, D>, v: Value<Self, D>) -> Self;
 
     fn annotations(&self) -> &Annotations<Self, D>;
@@ -655,6 +659,10 @@ impl<N: NestedValue<D>, D: Embeddable> Value<N, D> {
         self.as_string().ok_or_else(|| self.expected(ExpectedKind::String))
     }
 
+    pub fn bytestring<'a, V: Into<Cow<'a, [u8]>>>(v: V) -> Self {
+        Value::ByteString(v.into().into_owned())
+    }
+
     pub fn is_bytestring(&self) -> bool {
         self.as_bytestring().is_some()
     }