diff --git a/drivers/staging/comedi/drivers/rti800.c b/drivers/staging/comedi/drivers/rti800.c
index 0084038a8b0d..bab8b31a731d 100644
--- a/drivers/staging/comedi/drivers/rti800.c
+++ b/drivers/staging/comedi/drivers/rti800.c
@@ -223,7 +223,7 @@ static int rti800_ai_insn_read(struct comedi_device *dev,
 			data[i] ^= 0x800;
 	}
 
-	return i;
+	return insn->n;
 }
 
 static int rti800_ao_insn_read(struct comedi_device *dev,