diff --git a/src/green/interner.rs b/src/green/interner.rs
index 90d38cb..18cb3a8 100644
--- a/src/green/interner.rs
+++ b/src/green/interner.rs
@@ -4,6 +4,7 @@ use fxhash::FxBuildHasher;
 use lasso::{Capacity, Interner, IntoReader, IntoReaderAndResolver, IntoResolver, Reader, Resolver, Rodeo, Spur};
 
 /// The default [`Interner`] used to deduplicate green token strings.
+#[derive(Debug)]
 pub struct TokenInterner {
     rodeo: Rodeo<Spur, FxBuildHasher>,
 }
diff --git a/tests/basic.rs b/tests/basic.rs
index 8aeb207..de0b63e 100644
--- a/tests/basic.rs
+++ b/tests/basic.rs
@@ -142,4 +142,7 @@ fn assert_debug_display() {
     f::<SyntaxElement<(), lasso::Rodeo>>();
     f::<SyntaxElementRef<'static, (), lasso::Rodeo>>();
     f::<cstree::NodeOrToken<String, u128>>();
+
+    fn dbg<T: fmt::Debug>() {}
+    dbg::<GreenNodeBuilder<'static, 'static>>();
 }