diff --git a/src/librustc_trans/context.rs b/src/librustc_trans/context.rs
index b182f4de26b2..88edddad8c36 100644
--- a/src/librustc_trans/context.rs
+++ b/src/librustc_trans/context.rs
@@ -183,10 +183,7 @@ impl<'tcx> DepTrackingMapConfig for TraitSelectionCache<'tcx> {
     type Key = ty::PolyTraitRef<'tcx>;
     type Value = traits::Vtable<'tcx, ()>;
     fn to_dep_node(key: &ty::PolyTraitRef<'tcx>) -> DepNode<DefId> {
-        ty::tls::with(|tcx| {
-            let lifted_key = tcx.lift(key).unwrap();
-            lifted_key.to_poly_trait_predicate().dep_node()
-        })
+        key.to_poly_trait_predicate().dep_node()
     }
 }