diff --git a/compiler/mono/src/expand_rc.rs b/compiler/mono/src/expand_rc.rs
index 5b70006c84..2812252285 100644
--- a/compiler/mono/src/expand_rc.rs
+++ b/compiler/mono/src/expand_rc.rs
@@ -179,16 +179,12 @@ impl<'a, 'i> Env<'a, 'i> {
     pub fn unique_symbol(&mut self) -> Symbol {
         let ident_id = self.ident_ids.gen_unique();
 
-        self.home.register_debug_idents(self.ident_ids);
-
         Symbol::new(self.home, ident_id)
     }
     #[allow(dead_code)]
     fn manual_unique_symbol(home: ModuleId, ident_ids: &mut IdentIds) -> Symbol {
         let ident_id = ident_ids.gen_unique();
 
-        home.register_debug_idents(ident_ids);
-
         Symbol::new(home, ident_id)
     }
 }
diff --git a/compiler/mono/src/reset_reuse.rs b/compiler/mono/src/reset_reuse.rs
index 490314c885..64fde943c5 100644
--- a/compiler/mono/src/reset_reuse.rs
+++ b/compiler/mono/src/reset_reuse.rs
@@ -58,8 +58,6 @@ impl<'a, 'i> Env<'a, 'i> {
     fn unique_symbol(&mut self) -> Symbol {
         let ident_id = self.ident_ids.gen_unique();
 
-        self.home.register_debug_idents(self.ident_ids);
-
         Symbol::new(self.home, ident_id)
     }
 }