diff --git a/demo/python/cmd.py b/demo/python/cmd.py
index b970ef0..11994b0 100755
--- a/demo/python/cmd.py
+++ b/demo/python/cmd.py
@@ -86,7 +86,7 @@ def dump_cmd(cmd):
 #construct a comedi command
 cmd = c.comedi_cmd_struct()
 
-ret = c.comedi_get_cmd_generic_timed(dev,subdevice,cmd,1.0e9/freq)
+ret = c.comedi_get_cmd_generic_timed(dev,subdevice,cmd,nchans,1.0e9/freq)
 if ret: raise "Error comedi_get_cmd_generic failed"
 	
 cmd.chanlist = mylist # adjust for our particular context
diff --git a/demo/python/info.py b/demo/python/info.py
index fa26c06..15393e0 100755
--- a/demo/python/info.py
+++ b/demo/python/info.py
@@ -86,7 +86,7 @@ def probe_max_1chan(dev,s):
 	buf=""
 	cmd=c.comedi_cmd_struct()
 	print "\tcommand fast 1chan:"
-	if(c.comedi_get_cmd_generic_timed(dev,s,cmd,1)<0):
+	if(c.comedi_get_cmd_generic_timed(dev,s,cmd,1,1)<0):
 		print "\t\tnot supported"
 	else:
 		print "\tstart: %s %d" % (cmd_src(cmd.start_src,buf),cmd.start_arg)