diff --git a/src/mpExperienceNetperf.py b/src/mpExperienceNetperf.py
index de0abf9..64fc80a 100644
--- a/src/mpExperienceNetperf.py
+++ b/src/mpExperienceNetperf.py
@@ -48,7 +48,7 @@ class  MpExperienceNetperf(MpExperience):
 
 	def getClientCmd(self):
 		s = MpExperienceNetperf.NETPERF_BIN + " -H " + self.mpConfig.getServerIP() + \
-			" -l " + self.testlen + " -t " + self.testname + " -r " + self.reqres_size + \
+			" -l " + self.testlen + " -t " + self.testname + " -- -r " + self.reqres_size + \
 			" &>" + MpExperienceNetperf.NETPERF_LOG
 		print(s)
 		return s