diff --git a/lib/launchers/process.js b/lib/launchers/process.js
index 97f137aa0..f82bf7167 100644
--- a/lib/launchers/process.js
+++ b/lib/launchers/process.js
@@ -5,7 +5,7 @@ var env = process.env
 var ProcessLauncher = function (spawn, tempDir, timer, processKillTimeout) {
   var self = this
   var onExitCallback
-  var killTimeout = processKillTimeout
+  var killTimeout = processKillTimeout || 2000
 
   this._tempDir = tempDir.getPath('/karma-' + this.id.toString())