diff --git a/rust-version b/rust-version
index 1c54dc72ba4..dd746e9e2ae 100644
--- a/rust-version
+++ b/rust-version
@@ -1 +1 @@
-2d691170885b32502b391b8b1a0d54d2419a5653
+e1ec3260d79497080ca86540562d410ba67d2a95
diff --git a/src/shims/posix/sync.rs b/src/shims/posix/sync.rs
index 56d49698475..1b6112a3311 100644
--- a/src/shims/posix/sync.rs
+++ b/src/shims/posix/sync.rs
@@ -876,8 +876,7 @@ fn pthread_cond_destroy(&mut self, cond_op: &OpTy<'tcx, Tag>) -> InterpResult<'t
 
 fn layout_of_maybe_uninit<'tcx>(tcx: TyCtxtAt<'tcx>, param: Ty<'tcx>) -> TyAndLayout<'tcx> {
     let def_id = tcx.require_lang_item(LangItem::MaybeUninit, None);
-    let def_ty = tcx.type_of(def_id);
-    let ty = def_ty.subst(*tcx, &[param.into()]);
+    let ty = tcx.bound_type_of(def_id).subst(*tcx, &[param.into()]);
 
     let param_env = tcx.param_env(def_id);
     tcx.layout_of(param_env.and(ty)).unwrap()