diff --git a/src/librustc_typeck/check/mod.rs b/src/librustc_typeck/check/mod.rs
index d2a4b824439d..3e0527393cd1 100644
--- a/src/librustc_typeck/check/mod.rs
+++ b/src/librustc_typeck/check/mod.rs
@@ -1400,7 +1400,7 @@ fn check_union_fields(tcx: TyCtxt<'_>, _: Span, item_def_id: DefId) -> bool {
         return true;
     }
     let item_type = tcx.type_of(item_def_id);
-    if let ty::Adt(def, substs) = item_type.sty {
+    if let ty::Adt(def, substs) = item_type.kind {
         if def.is_union() {
             let fields = &def.non_enum_variant().fields;
             for field in fields {