diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 10cb7f6102c0c54aca424215f52ffbb0127de1f0..0e74039d380c1493f3226313812ba7455558a3dc 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -5153,7 +5153,7 @@ virDomainDiskDefParseXML(virDomainXMLOptionPtr xmlopt,
                        xmlStrEqual(cur->name, BAD_CAST "product")) {
                 product = (char *)xmlNodeGetContent(cur);
 
-                if (strlen(vendor) > PRODUCT_LEN) {
+                if (strlen(product) > PRODUCT_LEN) {
                     virReportError(VIR_ERR_XML_ERROR, "%s",
                                    _("disk product is more than 16 characters"));
                     goto error;