diff --git a/tests/ui/missing_const_for_fn/could_be_const.fixed b/tests/ui/missing_const_for_fn/could_be_const.fixed
index 921dcf0b1626..f8fc935f3679 100644
--- a/tests/ui/missing_const_for_fn/could_be_const.fixed
+++ b/tests/ui/missing_const_for_fn/could_be_const.fixed
@@ -104,15 +104,18 @@ fn main() {}
 
 struct D;
 
+/* FIXME(effects)
 impl const Drop for D {
     fn drop(&mut self) {
         todo!();
     }
 }
+*/
 
 // Lint this, since it can be dropped in const contexts
 // FIXME(effects)
-fn d(this: D) {}
+const fn d(this: D) {}
+//~^ ERROR: this could be a `const fn`
 
 mod msrv {
     struct Foo(*const u8, &'static u8);
diff --git a/tests/ui/missing_const_for_fn/could_be_const.stderr b/tests/ui/missing_const_for_fn/could_be_const.stderr
index 8ba42c0e5b67..8302b074127e 100644
--- a/tests/ui/missing_const_for_fn/could_be_const.stderr
+++ b/tests/ui/missing_const_for_fn/could_be_const.stderr
@@ -161,6 +161,11 @@ error: this could be a `const fn`
    |
 LL | fn d(this: D) {}
    | ^^^^^^^^^^^^^^^^
+   |
+help: make the function `const`
+   |
+LL | const fn d(this: D) {}
+   | +++++
 
 error: this could be a `const fn`
   --> tests/ui/missing_const_for_fn/could_be_const.rs:125:9