diff --git a/lib/Dicer.js b/lib/Dicer.js
index 9d580cb..4c21db7 100644
--- a/lib/Dicer.js
+++ b/lib/Dicer.js
@@ -203,7 +203,9 @@ Dicer.prototype._oninfo = function(isMatch, data, start, end) {
     if (this._isPreamble)
       this._isPreamble = false;
     else {
-      ++this._parts;
+      // Only the non-empty part will be counted.
+      // Because the onEnd function is only called in the onHeader event.
+      (end > start) && ++this._parts;
       this._part.on('end', function() {
         if (--self._parts === 0) {
           if (self._finished) {