1 files changed, 1 insertions, 1 deletions
diff --git a/src/pretty.rs b/src/pretty.rs
index 46b82eb7..83c207b5 100644
--- a/src/pretty.rs
+++ b/src/pretty.rs
@@ -617,7 +617,7 @@ mod tests {
         ($($k:ident: $v:expr),* $(,)?) => {{
             #[allow(unused_mut)]
             let mut m = BTreeMap::new();
-            $(m.insert(stringify!($k).to_string(), $v);)*
+            $(m.insert(stringify!($k).into(), $v);)*
             m
         }};
     }