diff --git a/rust/lib.rs b/rust/lib.rs
index 122743c..4b96379 100644
--- a/rust/lib.rs
+++ b/rust/lib.rs
@@ -90,5 +90,7 @@ extern "C" fn sum_slice(v: *const i64, s: usize) -> i64 {
 
 #[unsafe(no_mangle)]
 extern "C" fn print_optional(x: Option<&i8>) {
-    if let Some(x) = x { println!("{}", x / 2) }
+    if let Some(x) = x {
+        println!("{}", x / 2)
+    }
 }