diff --git a/src/test/run-pass/issue-39808.rs b/src/test/run-pass/issue-39808.rs
index 00c2bdc8cc9..91c70d76eef 100644
--- a/src/test/run-pass/issue-39808.rs
+++ b/src/test/run-pass/issue-39808.rs
@@ -19,7 +19,7 @@ use std::borrow::Cow;
 
 fn main() {
     let _ = if false {
-        Cow::Owned(format!("{:?}", panic!())) /* as Cow<str> */ // uncomment to fix
+        Cow::Owned(format!("{:?}", panic!()))
     } else {
         Cow::Borrowed("")
     };