diff --git a/neutron_tempest_plugin/scenario/base.py b/neutron_tempest_plugin/scenario/base.py
index fa91b31..dd91130 100644
--- a/neutron_tempest_plugin/scenario/base.py
+++ b/neutron_tempest_plugin/scenario/base.py
@@ -332,7 +332,7 @@
                     mtu=mtu, ip_version=ip_version))
             if pattern:
                 cmd += ' -p {pattern}'.format(pattern=pattern)
-            cmd += ' -c{0} -w{0} -s{1} {2}'.format(count, size, host)
+            cmd += ' -c{0} -W{0} -s{1} {2}'.format(count, size, host)
             return source.exec_command(cmd)
 
         def ping_remote():