diff --git a/pyeapi/eapilib.py b/pyeapi/eapilib.py
index bee3494..773431d 100644
--- a/pyeapi/eapilib.py
+++ b/pyeapi/eapilib.py
@@ -349,8 +349,8 @@ def request(self, commands, encoding=None, reqid=None, **kwargs):
             'format': kwargs.pop('format', encoding) }           
         params.update( kwargs )
         params.update({ 'cmds': commands })
-        params = { k:v for k,v in params.items() if k in 
-            ('version', 'cmds', 'autoComplete', 'expandAliases', 'timestamps' ) }
+        params = { k:v for k,v in params.items() if k in ('version',
+            'format', 'cmds', 'autoComplete', 'expandAliases', 'timestamps') }
         return json.dumps( {'jsonrpc': '2.0', 'method': 'runCmds',
                            'params': params, 'id': str(reqid),
                            'streaming': streaming} )