diff --git a/lib/tmp.js b/lib/tmp.js
index 42cc6e4..1ba4bc9 100644
--- a/lib/tmp.js
+++ b/lib/tmp.js
@@ -480,8 +480,7 @@ function _generateTmpName(opts) {
     process.pid,
     '-',
     _randomChars(12),
-    '-',
-    opts.postfix ? opts.postfix : ''
+    opts.postfix ? '-' + opts.postfix : ''
   ].join('');
 
   return path.join(tmpDir, opts.dir, name);