diff --git a/drivers/scsi/mpt2sas/mpt2sas_ctl.h b/drivers/scsi/mpt2sas/mpt2sas_ctl.h
index dbb6c0c..5bd7d4c 100644
--- a/drivers/scsi/mpt2sas/mpt2sas_ctl.h
+++ b/drivers/scsi/mpt2sas/mpt2sas_ctl.h
@@ -50,7 +50,7 @@
 #endif
 
 #define MPT2SAS_DEV_NAME	"mpt2ctl"
-#define MPT2_MAGIC_NUMBER	'm'
+#define MPT2_MAGIC_NUMBER	'L'
 #define MPT2_IOCTL_DEFAULT_TIMEOUT (10) /* in seconds */
 
 /**