diff --git a/src/main.coffee b/src/main.coffee
index 0f1359348..32daf4c9b 100644
--- a/src/main.coffee
+++ b/src/main.coffee
@@ -38,7 +38,7 @@ parseCommandLine = ->
   executedFrom = args['executed-from']
   pathsToOpen = if args._.length > 0 then args._ else null
   pathsToOpen ?= [executedFrom] if executedFrom
-  pathsToOpen = pathsToOpen.map (pathToOpen) ->
+  pathsToOpen = pathsToOpen?.map (pathToOpen) ->
     path.resolve(executedFrom ? process.cwd(), pathToOpen)
   test = args['test']
   pidToKillWhenClosed = args['pid'] if args['wait']