diff --git a/compiler/rustc_session/src/cstore.rs b/compiler/rustc_session/src/cstore.rs
index 97aa930b5ec..ff13a0bbf3f 100644
--- a/compiler/rustc_session/src/cstore.rs
+++ b/compiler/rustc_session/src/cstore.rs
@@ -252,7 +252,6 @@ fn expn_hash_to_expn_id(
 
 pub type CrateStoreDyn = dyn CrateStore + sync::Sync + sync::Send;
 
-#[derive(Debug)]
 pub struct Untracked {
     pub cstore: RwLock<Box<CrateStoreDyn>>,
     /// Reference span for definitions.