diff --git a/lib/motion/project.rb b/lib/motion/project.rb
index 365bbc3e..f8e6522c 100644
--- a/lib/motion/project.rb
+++ b/lib/motion/project.rb
@@ -57,13 +57,18 @@ task :simulator => ['build:simulator'] do
   end
 
   # Prepare the device family.
-  family_int =
+  family_int, retina =
     if family = ENV['device_family']
-      App.config.device_family_int(family.downcase.intern)
+      str = family.downcase
+      retina = str.sub!(/\:retina$/, '') ? true : false
+      [App.config.device_family_int(str.intern), retina]
     else
-      App.config.device_family_ints[0]
+      [App.config.device_family_ints[0], false]
     end
 
+  # Configure the SimulateDevice variable (the only way to specify if we want to run in retina mode or not).
+  sh "/usr/bin/defaults write com.apple.iphonesimulator \"SimulateDevice\" \"'#{App.config.device_family_string(family_int, retina)}'\""
+
   # Launch the simulator.
   xcode = App.config.xcode_dir
   env = xcode.match(/^\/Applications/) ? "DYLD_FRAMEWORK_PATH=\"#{xcode}/../Frameworks\":\"#{xcode}/../OtherFrameworks\"" : ''
diff --git a/lib/motion/project/config.rb b/lib/motion/project/config.rb
index c2dd6704..90345bbb 100644
--- a/lib/motion/project/config.rb
+++ b/lib/motion/project/config.rb
@@ -381,6 +381,16 @@ EOS
       end
     end
 
+    def device_family_string(family, retina)
+      device = case family
+        when :iphone, 1
+          "iPhone"
+        when :ipad, 2
+          "iPad"
+      end
+      retina ? device + " (Retina)" : device
+    end
+
     def device_family_ints
       ary = @device_family.is_a?(Array) ? @device_family : [@device_family]
       ary.map { |family| device_family_int(family) }