diff --git a/src/codegen/header.rs b/src/codegen/header.rs
index 8f3b840..0ed2662 100644
--- a/src/codegen/header.rs
+++ b/src/codegen/header.rs
@@ -233,7 +233,10 @@ pub fn generate(manifest: &Manifest, output_dir: &Path) -> Result<()> {
 fn write_abi_header(output_dir: &Path, safe_name: &str, upper: &str) -> Result<()> {
     let mut h = String::with_capacity(2048);
     writeln!(h, "/* SPDX-License-Identifier: MPL-2.0 */")?;
-    writeln!(h, "/* Auto-generated by Chapeliser — do not edit manually. */")?;
+    writeln!(
+        h,
+        "/* Auto-generated by Chapeliser — do not edit manually. */"
+    )?;
     writeln!(
         h,
         "/* C-ABI prototypes for the c_* bridge the generated Chapel calls. */"