diff --git a/src/librustc_mir/build/scope.rs b/src/librustc_mir/build/scope.rs
index bfc1028afbe..baacc8ca9a9 100644
--- a/src/librustc_mir/build/scope.rs
+++ b/src/librustc_mir/build/scope.rs
@@ -282,7 +282,7 @@ impl<'a,'tcx> Builder<'a,'tcx> {
         self.scope_auxiliary[scope.id.index()]
             .postdoms
             .push(self.cfg.current_location(block));
-        block.and(())
+        block.unit()
     }