diff --git a/lib/motion/project.rb b/lib/motion/project.rb
index 8ada0de8..2082da2a 100644
--- a/lib/motion/project.rb
+++ b/lib/motion/project.rb
@@ -92,7 +92,7 @@ task :simulator => ['build:simulator'] do
   # Configure the SimulateDevice variable (the only way to specify if we want to run in retina mode or not).
   simulate_device = App.config.device_family_string(family_int, retina)
   if `/usr/bin/defaults read com.apple.iphonesimulator "SimulateDevice"`.strip != simulate_device
-    system("/usr/bin/killall \"iPhone Simulator\"")
+    system("/usr/bin/killall \"iPhone Simulator\" >& /dev/null")
     system("/usr/bin/defaults write com.apple.iphonesimulator \"SimulateDevice\" \"'#{App.config.device_family_string(family_int, retina)}'\"")
   end