diff --git a/src/browser/squirrel-update.coffee b/src/browser/squirrel-update.coffee
index 4d221aee2..a7d18a5fb 100644
--- a/src/browser/squirrel-update.coffee
+++ b/src/browser/squirrel-update.coffee
@@ -9,14 +9,13 @@ exeName = path.basename(process.execPath)
 # Spawn the Update.exe with the given arguments and invoke the callback when
 # the command completes.
 exports.spawn = (args, callback) ->
+  command = process.env.comspec or 'cmd.exe'
   args = args.map (arg) -> "\"#{arg.toString().replace(/"/g, '\\"')}\""
   if /\s/.test(updateDotExe)
     args.unshift("\"#{updateDotExe}\"")
   else
     args.unshift(updateDotExe)
-
-  args = ['/s', '/c', "\"#{cmdArgs.join(' ')}\""]
-  command = process.env.comspec or 'cmd.exe'
+  args = ['/s', '/c', "\"#{args.join(' ')}\""]
 
   updateProcess = ChildProcess.spawn(command, args, windowsVerbatimArguments: true)