diff --git a/swig/comedi.i b/swig/comedi.i
index 2328bf3..f104692 100644
--- a/swig/comedi.i
+++ b/swig/comedi.i
@@ -519,7 +519,7 @@ int comedi_get_cmd_src_mask(comedi_t *dev,unsigned int subdevice,
 int comedi_get_cmd_generic_timed(comedi_t *dev,unsigned int subdevice,
 	comedi_cmd *INOUT,unsigned int ns);
 int comedi_cancel(comedi_t *it,unsigned int subdevice);
-int comedi_command(comedi_t *it,comedi_cmd *INOUT);
+int comedi_command(comedi_t *it,comedi_cmd *cmd);
 int comedi_command_test(comedi_t *it,comedi_cmd *INOUT);
 int comedi_poll(comedi_t *dev,unsigned int subdevice);