diff --git a/ostd/src/logger.rs b/ostd/src/logger.rs
index 0e79d0de9..6539ea5e2 100644
--- a/ostd/src/logger.rs
+++ b/ostd/src/logger.rs
@@ -34,7 +34,7 @@ impl log::Log for Logger {
             return;
         }
 
-        let timestamp = format!("[{:>10?}]", Jiffies::elapsed().as_duration().as_secs_f64());
+        let timestamp = format!("[{:>10.3}]", Jiffies::elapsed().as_duration().as_secs_f64());
         let level = format!("{:<5}", record.level());
         let record_str = format!("{}", record.args());