diff --git a/tests/ui/parse_key.stderr b/tests/ui/parse_key.stderr
index f10c21800..15662dc50 100644
--- a/tests/ui/parse_key.stderr
+++ b/tests/ui/parse_key.stderr
@@ -2,4 +2,4 @@ error[E0609]: no field `s` on type `&'static str`
  --> tests/ui/parse_key.rs:4:16
   |
 4 |     json!({ "".s : true });
-  |                ^
+  |                ^ unknown field