diff --git a/lib/node-progress.js b/lib/node-progress.js
index 8eb0740..c77c80d 100644
--- a/lib/node-progress.js
+++ b/lib/node-progress.js
@@ -89,7 +89,7 @@ ProgressBar.prototype.tick = function(len, tokens){
   if (tokens) this.tokens = tokens;
 
   // start time for eta
-  if (0 == this.curr) this.start = new Date;
+  if (!this.start) this.start = new Date;
 
   this.curr += len