diff --git a/multimechanize/utilities/run.py b/multimechanize/utilities/run.py
index f667414..d761070 100755
--- a/multimechanize/utilities/run.py
+++ b/multimechanize/utilities/run.py
@@ -95,7 +95,10 @@ def run_test(project_name, cmd_opts, remote_starter=None):
                             script_file, run_time, rampup)
         user_groups.append(ug)
     for user_group in user_groups:
-        user_group.start()
+        if sys.platform.startswith('win'):
+            user_group.run()
+        else:
+            user_group.start()
 
     start_time = time.time()