diff --git a/script/test.py b/script/test.py
index 21a1083cb1e9..712c94128b59 100755
--- a/script/test.py
+++ b/script/test.py
@@ -11,13 +11,17 @@ SOURCE_ROOT = os.path.abspath(os.path.dirname(os.path.dirname(__file__)))
 def main():
   os.chdir(SOURCE_ROOT)
 
+  config = 'D'
+  if len(sys.argv) == 2 and sys.argv[1] == '-R':
+    config = 'R'
+
   if sys.platform == 'darwin':
-    atom_shell = os.path.join(SOURCE_ROOT, 'out', 'D', 'Atom.app',
+    atom_shell = os.path.join(SOURCE_ROOT, 'out', config, 'Atom.app',
                               'Contents', 'MacOS', 'Atom')
   elif sys.platform == 'win32':
-    atom_shell = os.path.join(SOURCE_ROOT, 'out', 'D', 'atom.exe')
+    atom_shell = os.path.join(SOURCE_ROOT, 'out', config, 'atom.exe')
   else:
-    atom_shell = os.path.join(SOURCE_ROOT, 'out', 'D', 'atom')
+    atom_shell = os.path.join(SOURCE_ROOT, 'out', config, 'atom')
 
   subprocess.check_call([atom_shell, 'spec'] + sys.argv[1:])