diff --git a/lib/launchers/process.js b/lib/launchers/process.js
index c9416334b..067cfae87 100644
--- a/lib/launchers/process.js
+++ b/lib/launchers/process.js
@@ -22,7 +22,7 @@ var ProcessLauncher = function(spawn, tempDir, timer) {
 
     onExitCallback = done;
     self._process.kill();
-    timer.setTimeout(self._onKillTimeout, killTimeout);
+    self._killTimer = timer.setTimeout(self._onKillTimeout, killTimeout);
   });
 
   this._start = function(url) {
@@ -110,6 +110,10 @@ var ProcessLauncher = function(spawn, tempDir, timer) {
     }
 
     self._process = null;
+    if (self._killTimer) {
+      timer.clearTimeout(self._killTimer);
+      self._killTimer = null;
+    }
     self._clearTempDirAndReportDone(error);
   };