diff --git a/README.md b/README.md
index 96868c6..d1860ad 100644
--- a/README.md
+++ b/README.md
@@ -73,6 +73,15 @@ scen = pysipp.scenario(dirpath='path/to/test_scenario/',
 scen()
 ```
 
+**pysipp** by default uses `-screen_file` SIPp argument to redirect output,
+ but this argument is only available in SIPp version >= [3.5.0](https://sourceforge.net/p/sipp/mailman/message/34041962/),
+ for lower versions to run properly, this argument must be
+  disable setting `enable_screen_file` to `False`:
+ 
+```python
+scen = pysipp.scenario(enable_screen_file=False)
+```
+
 If you've got multiple such scenario directories you can iterate over
 them:
 
diff --git a/pysipp/agent.py b/pysipp/agent.py
index 1c0881d..a57a312 100644
--- a/pysipp/agent.py
+++ b/pysipp/agent.py
@@ -16,7 +16,6 @@
 
 
 def tuple_property(attrs):
-
     def getter(self):
         tup = tuple(getattr(self, attr) for attr in attrs)
         if all(tup):
@@ -77,10 +76,11 @@ def is_client(self):
     def is_server(self):
         return 'uas' in self.name.lower()
 
-    def iter_logfile_items(self, types_attr='_log_types'):
+    def iter_logfile_items(self, types_attr='_log_types', enable_screen_file=True):
         for name in getattr(self, types_attr):
-            attr_name = name + '_file'
-            yield attr_name, getattr(self, attr_name)
+            if name != 'screen' or enable_screen_file:
+                attr_name = name + '_file'
+                yield attr_name, getattr(self, attr_name)
 
     def iter_toconsole_items(self):
         yield 'screen_file', self.screen_file
@@ -118,11 +118,11 @@ def enable_tracing(self):
             attr_name = 'trace_' + name
             setattr(self, attr_name, True)
 
-    def enable_logging(self, logdir=None, debug=False):
+    def enable_logging(self, logdir=None, debug=False, enable_screen_file=True):
         """Enable agent logging by appending appropriately named log file
         arguments to the underlying command.
         """
-        logattrs = self.iter_logfile_items()
+        logattrs = self.iter_logfile_items(enable_screen_file=enable_screen_file)
         if debug:
             logattrs = itertools.chain(
                 logattrs,
@@ -233,8 +233,9 @@ class ScenarioType(object):
 
     If called it will invoke the standard run hooks.
     """
+
     def __init__(self, agents, defaults, clientdefaults=None,
-                 serverdefaults=None, confpy=None):
+                 serverdefaults=None, confpy=None, enable_screen_file=True):
         # agents iterable in launch-order
         self._agents = agents
         ua_attrs = UserAgent.keys()
@@ -253,6 +254,7 @@ def __init__(self, agents, defaults, clientdefaults=None,
 
         # hook module
         self.mod = confpy
+        self.enable_screen_file = enable_screen_file
 
     @property
     def agents(self):
@@ -330,6 +332,7 @@ def prepare_agent(self, agent):
         """Return a new agent with all default settings applied from this
         scenario
         """
+
         def merge(dicts):
             """Merge dicts without clobbering up to 1 level deep's worth of
             sub-dicts
@@ -364,7 +367,8 @@ def merge(dicts):
         params = merge(ordered)
         log.debug("merged contents:\n{}".format(params))
         ua = UserAgent(defaults=params)
-        ua.enable_logging()
+
+        ua.enable_logging(enable_screen_file=self.enable_screen_file)
 
         # call post defaults hook
         plugin.mng.hook.pysipp_post_ua_defaults(ua=ua)