diff --git a/include/scsi/scsi.h b/include/scsi/scsi.h
index 6cb1e27..c60b8ff 100644
--- a/include/scsi/scsi.h
+++ b/include/scsi/scsi.h
@@ -32,6 +32,12 @@
 extern const char *const scsi_device_types[MAX_SCSI_DEVICE_CODE];
 
 /*
+ * Special value for scanning to specify scanning or rescanning of all
+ * possible channels, (target) ids, or luns on a given shost.
+ */
+#define SCAN_WILD_CARD	~0
+
+/*
  *      SCSI opcodes
  */