diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 9580884747..badc2da487 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -4850,7 +4850,7 @@ virDomainSCSIDriveAddressIsUsed(const virDomainDef *def,
             break;
         }
 
-        if (max != -1 && addr->unit >= max)
+        if (max != -1 && addr->unit > max)
             return true;
         if (reserved != -1 && addr->unit == reserved)
             return true;