diff --git a/artiq/firmware/libboard_misoc/uart_logger.rs b/artiq/firmware/libboard_misoc/uart_logger.rs
index 751967c5a..e3e26f6cf 100644
--- a/artiq/firmware/libboard_misoc/uart_logger.rs
+++ b/artiq/firmware/libboard_misoc/uart_logger.rs
@@ -25,8 +25,8 @@ impl Log for ConsoleLogger {
             let seconds   = timestamp / 1_000_000;
             let micros    = timestamp % 1_000_000;
 
-            let _ = write!(Console, "[{:6}.{:06}s] {:>5}({}): {}",
-                           seconds, micros, record.level(), record.target(), record.args());
+            let _ = writeln!(Console, "[{:6}.{:06}s] {:>5}({}): {}",
+                             seconds, micros, record.level(), record.target(), record.args());
         }
     }