diff --git a/rules/interface.go b/rules/interface.go
index 9e95f60..f79885f 100644
--- a/rules/interface.go
+++ b/rules/interface.go
@@ -32,7 +32,7 @@ func (br *BaseRule) baseInsert(category string, hostname string, paramsJSON []by
 }
 
 func (br *BaseRule) baseUpdate(category string, oldhostname string, hostname string, paramsJSON []byte) error {
-	exists, err := db.HostnameExists(category, hostname)
+	exists, err := db.HostnameExists(category, oldhostname)
 	if err != nil {
 		return fmt.Errorf("error checking existence of hostname: %v", err.Error())
 	}