diff --git a/tests/ui/vec_box_sized.rs b/tests/ui/vec_box_sized.rs
index e46f5bf21266..49eaf8e062af 100644
--- a/tests/ui/vec_box_sized.rs
+++ b/tests/ui/vec_box_sized.rs
@@ -63,6 +63,9 @@ mod should_not_trigger {
     fn allocator_mismatch() -> Vec<Box<i32, DummyAllocator>> {
         Vec::new()
     }
+    fn allocator_mismatch_2() -> Vec<Box<i32>, DummyAllocator> {
+        Vec::new_in(DummyAllocator)
+    }
 }
 
 mod inner_mod {
diff --git a/tests/ui/vec_box_sized.stderr b/tests/ui/vec_box_sized.stderr
index db5674210d94..d6479271fa63 100644
--- a/tests/ui/vec_box_sized.stderr
+++ b/tests/ui/vec_box_sized.stderr
@@ -50,7 +50,7 @@ LL |     fn allocator_match() -> Vec<Box<i32, DummyAllocator>, DummyAllocator> {
    |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `Vec<i32>`
 
 error: `Vec<T>` is already on the heap, the boxing is unnecessary
-  --> $DIR/vec_box_sized.rs:76:23
+  --> $DIR/vec_box_sized.rs:79:23
    |
 LL |         pub fn f() -> Vec<Box<S>> {
    |                       ^^^^^^^^^^^ help: try: `Vec<S>`