diff --git a/crates/fayalite/src/intern.rs b/crates/fayalite/src/intern.rs
index 4969bcb..97dafe1 100644
--- a/crates/fayalite/src/intern.rs
+++ b/crates/fayalite/src/intern.rs
@@ -598,7 +598,7 @@ struct InternerState<T: ?Sized + 'static + Send + Sync> {
     hasher: DefaultBuildHasher,
 }
 
-pub struct Interner<T: ?Sized + 'static + Send + Sync> {
+pub(crate) struct Interner<T: ?Sized + 'static + Send + Sync> {
     state: Mutex<InternerState<T>>,
 }