diff --git a/NEWS b/NEWS
index 8a7bf9c4..d52b3b35 100644
--- a/NEWS
+++ b/NEWS
@@ -21,7 +21,7 @@
   * Fixed a bug where it would hold an object if it would call the #initXXX in
     the #initialize of a class inherited Objective-C class.
   * Added a feature which passing the arguments on launching app.
-    (Ex app.sim_args = "-com.apple.CoreData.SQLDebug 1")
+    (Ex app.sim_args += ["-com.apple.CoreData.SQLDebug", "1"])
   * Fixed a bug in #respond_to? where WeakRef objects would not be properly
     handled.
   * [OSX] Fixed a bug in `rake debug=1' where the debugger would not properly
diff --git a/lib/motion/project/template/ios.rb b/lib/motion/project/template/ios.rb
index 20545828..28d31a0f 100644
--- a/lib/motion/project/template/ios.rb
+++ b/lib/motion/project/template/ios.rb
@@ -88,10 +88,10 @@ task :simulator => ['build:simulator'] do
   env << ' SIM_SPEC_MODE=1' if App.config.spec_mode
   sim = File.join(App.config.bindir, 'ios/sim')
   debug = (ENV['debug'] ? 1 : (App.config.spec_mode ? '0' : '2'))
-  app_args = App.config.sim_args.map { |x| '"' + x + '"' }
+  app_args = App.config.sim_args.map { |x| '"' + x + '"' }.join(" ")
   App.info 'Simulate', app
   at_exit { system("stty echo") } if $stdout.tty? # Just in case the simulator launcher crashes and leaves the terminal without echo.
-  sh "#{env} #{sim} #{debug} #{family_int} #{target} \"#{xcode}\" \"#{app}\" \"#{app_args}\""
+  sh "#{env} #{sim} #{debug} #{family_int} #{target} \"#{xcode}\" \"#{app}\" #{app_args}"
 end
 
 desc "Create an .ipa archive"
diff --git a/lib/motion/project/template/osx.rb b/lib/motion/project/template/osx.rb
index 0bde2c25..67f8eeff 100644
--- a/lib/motion/project/template/osx.rb
+++ b/lib/motion/project/template/osx.rb
@@ -57,10 +57,10 @@ task :run => 'build:development' do
   sim = File.join(App.config.bindir, 'osx/sim')
   debug = (ENV['debug'] ? 1 : (App.config.spec_mode ? '0' : '2'))
   target = App.config.sdk_version
-  app_args = App.config.sim_args.map { |x| '"' + x + '"' }
+  app_args = App.config.sim_args.map { |x| '"' + x + '"' }.join(" ")
   App.info 'Run', exec
   at_exit { system("stty echo") } if $stdout.tty? # Just in case the process crashes and leaves the terminal without echo.
-  sh "#{env} #{sim} #{debug} #{target} \"#{exec}\" \"#{app_args}\""
+  sh "#{env} #{sim} #{debug} #{target} \"#{exec}\" #{app_args}"
 end
 
 desc "Run the test/spec suite"