diff --git a/src/librustc_passes/rvalue_promotion.rs b/src/librustc_passes/rvalue_promotion.rs
index 20f31b3ebc173..b76ab805a4567 100644
--- a/src/librustc_passes/rvalue_promotion.rs
+++ b/src/librustc_passes/rvalue_promotion.rs
@@ -41,10 +41,9 @@ pub fn provide(providers: &mut Providers<'_>) {
 }
 
 pub fn check_crate<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>) {
-    for &body_id in &tcx.hir().krate().body_ids {
-        let def_id = tcx.hir().body_owner_def_id(body_id);
-        tcx.const_is_rvalue_promotable_to_static(def_id);
-    }
+    tcx.par_body_owners(|body_owner_def_id| {
+        tcx.const_is_rvalue_promotable_to_static(body_owner_def_id);
+    });
 }
 
 fn const_is_rvalue_promotable_to_static<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,