diff --git a/sound/drivers/serial-u16550.c b/sound/drivers/serial-u16550.c
index 112ddf7..13b46d1 100644
--- a/sound/drivers/serial-u16550.c
+++ b/sound/drivers/serial-u16550.c
@@ -989,8 +989,10 @@
 		return err;
 
 	cards = 0;
-	for (i = 0; i < SNDRV_CARDS && enable[i]; i++) {
+	for (i = 0; i < SNDRV_CARDS; i++) {
 		struct platform_device *device;
+		if (! enable[i])
+			continue;
 		device = platform_device_register_simple(SND_SERIAL_DRIVER,
 							 i, NULL, 0);
 		if (IS_ERR(device)) {