diff --git a/drivers/staging/comedi/drivers/addi_apci_3120.c b/drivers/staging/comedi/drivers/addi_apci_3120.c
index 9f5d7a528945..fd6f64ab7fc1 100644
--- a/drivers/staging/comedi/drivers/addi_apci_3120.c
+++ b/drivers/staging/comedi/drivers/addi_apci_3120.c
@@ -23,7 +23,6 @@ struct apci3120_board {
 	int i_AiMaxdata;
 	int i_AoMaxdata;
 	int i_NbrDiChannel;
-	int i_NbrDoChannel;
 };
 
 static const struct apci3120_board apci3120_boardtypes[] = {
@@ -36,7 +35,6 @@ static const struct apci3120_board apci3120_boardtypes[] = {
 		.i_AiMaxdata		= 0xffff,
 		.i_AoMaxdata		= 0x3fff,
 		.i_NbrDiChannel		= 4,
-		.i_NbrDoChannel		= 4,
 	},
 	[BOARD_APCI3001] = {
 		.name			= "apci3001",
@@ -45,7 +43,6 @@ static const struct apci3120_board apci3120_boardtypes[] = {
 		.i_AiChannelList	= 16,
 		.i_AiMaxdata		= 0xfff,
 		.i_NbrDiChannel		= 4,
-		.i_NbrDoChannel		= 4,
 	},
 };
 
@@ -162,9 +159,8 @@ static int apci3120_auto_attach(struct comedi_device *dev,
 	s->type = COMEDI_SUBD_DO;
 	s->subdev_flags =
 		SDF_READABLE | SDF_WRITEABLE | SDF_GROUND | SDF_COMMON;
-	s->n_chan = this_board->i_NbrDoChannel;
+	s->n_chan = 4;
 	s->maxdata = 1;
-	s->len_chanlist = this_board->i_NbrDoChannel;
 	s->range_table = &range_digital;
 	s->insn_bits = apci3120_do_insn_bits;