diff --git a/drivers/scsi/sr_ioctl.c b/drivers/scsi/sr_ioctl.c
index 5d02ff4..b65462f 100644
--- a/drivers/scsi/sr_ioctl.c
+++ b/drivers/scsi/sr_ioctl.c
@@ -192,7 +192,7 @@
 	SDev = cd->device;
 
 	if (!sense) {
-		sense = kmalloc(sizeof(*sense), GFP_KERNEL);
+		sense = kmalloc(SCSI_SENSE_BUFFERSIZE, GFP_KERNEL);
 		if (!sense) {
 			err = -ENOMEM;
 			goto out;