diff --git a/fs/api_timer.js b/fs/api_timer.js
index e324086..a79e6e2 100644
--- a/fs/api_timer.js
+++ b/fs/api_timer.js
@@ -43,7 +43,7 @@ let Timer = {
   // ```
   fmt: function(fmt, time) {
     if (!fmt) return 'invalid format';
-    let res = 0, t = Math.round(time || Timer.now()), s = '     ';
+    let res = 0, t = Math.round(time || Timer.now()), s = '      ';
     while (res === 0) {
       res = this._f(s, s.length, fmt, t);
       if (res === -1) return 'invalid time';