diff --git a/compiler/rustc_hir_typeck/src/fn_ctxt/mod.rs b/compiler/rustc_hir_typeck/src/fn_ctxt/mod.rs
index 6e4a464905fa..954a0956b70d 100644
--- a/compiler/rustc_hir_typeck/src/fn_ctxt/mod.rs
+++ b/compiler/rustc_hir_typeck/src/fn_ctxt/mod.rs
@@ -213,8 +213,8 @@ impl<'a, 'tcx> Deref for FnCtxt<'a, 'tcx> {
     }
 }
 
-impl<'a, 'tcx> HirTyLowerer<'tcx> for FnCtxt<'a, 'tcx> {
-    fn tcx<'b>(&'b self) -> TyCtxt<'tcx> {
+impl<'tcx> HirTyLowerer<'tcx> for FnCtxt<'_, 'tcx> {
+    fn tcx(&self) -> TyCtxt<'tcx> {
         self.tcx
     }