diff --git a/implementations/rust/preserves-schema/src/support/mod.rs b/implementations/rust/preserves-schema/src/support/mod.rs
index cd1e92a..e159574 100644
--- a/implementations/rust/preserves-schema/src/support/mod.rs
+++ b/implementations/rust/preserves-schema/src/support/mod.rs
@@ -23,8 +23,8 @@ pub trait Parse<L, Value: NestedValue>: Sized {
     fn parse(language: L, value: &Value) -> Result<Self, ParseError>;
 }
 
-impl<Value: NestedValue> Parse<(), Value> for Value {
-    fn parse(_language: (), value: &Value) -> Result<Self, ParseError> {
+impl<'a, Value: NestedValue> Parse<&'a (), Value> for Value {
+    fn parse(_language: &'a (), value: &Value) -> Result<Self, ParseError> {
         Ok(value.clone())
     }
 }
@@ -33,8 +33,8 @@ pub trait Unparse<L, Value: NestedValue> {
     fn unparse(&self, language: L) -> Value;
 }
 
-impl<Value: NestedValue> Unparse<(), Value> for Value {
-    fn unparse(&self, _language: ()) -> Value {
+impl<'a, Value: NestedValue> Unparse<&'a (), Value> for Value {
+    fn unparse(&self, _language: &'a ()) -> Value {
         self.clone()
     }
 }