diff --git a/artiq/firmware/runtime/main.rs b/artiq/firmware/runtime/main.rs
index 181981df6..0be6550b3 100644
--- a/artiq/firmware/runtime/main.rs
+++ b/artiq/firmware/runtime/main.rs
@@ -152,7 +152,8 @@ fn setup_si5324_as_synthesizer()
         bwsel  : 3,
         crystal_ref: true
     };
-    board_artiq::si5324::setup(&SI5324_SETTINGS, si5324::Input::Ckin2).expect("cannot initialize Si5324");
+    board_artiq::si5324::setup(&SI5324_SETTINGS,
+        board_artiq::si5324::Input::Ckin2).expect("cannot initialize Si5324");
 }
 
 #[cfg(has_ethmac)]