diff --git a/compiler/rustc_trait_selection/src/traits/codegen/mod.rs b/compiler/rustc_trait_selection/src/traits/codegen/mod.rs
index dd7ea55cc104..753d64d6115f 100644
--- a/compiler/rustc_trait_selection/src/traits/codegen/mod.rs
+++ b/compiler/rustc_trait_selection/src/traits/codegen/mod.rs
@@ -19,11 +19,11 @@ use rustc_middle::ty::{self, TyCtxt};
 /// obligations *could be* resolved if we wanted to.
 /// Assumes that this is run after the entire crate has been successfully type-checked.
 pub fn codegen_fulfill_obligation<'tcx>(
-    ty: TyCtxt<'tcx>,
+    tcx: TyCtxt<'tcx>,
     (param_env, trait_ref): (ty::ParamEnv<'tcx>, ty::PolyTraitRef<'tcx>),
 ) -> Result<ImplSource<'tcx, ()>, ErrorReported> {
-    // Remove any references to regions; this helps improve caching.
-    let trait_ref = ty.erase_regions(&trait_ref);
+    // Remove any references to regions and normalize; this helps improve caching.
+    let trait_ref = tcx.normalize_erasing_regions(param_env, trait_ref);
 
     debug!(
         "codegen_fulfill_obligation(trait_ref={:?}, def_id={:?})",
@@ -33,7 +33,7 @@ pub fn codegen_fulfill_obligation<'tcx>(
 
     // Do the initial selection for the obligation. This yields the
     // shallow result we are looking for -- that is, what specific impl.
-    ty.infer_ctxt().enter(|infcx| {
+    tcx.infer_ctxt().enter(|infcx| {
         let mut selcx = SelectionContext::new(&infcx);
 
         let obligation_cause = ObligationCause::dummy();