diff --git a/lib/vm-util b/lib/vm-util
index 20d1d94..f60f9ee 100644
--- a/lib/vm-util
+++ b/lib/vm-util
@@ -361,7 +361,7 @@ util::check_name(){
     local _maxlen="$2"
 
     if [ ${VERSION_BSD} -ge 1300000 ]; then
-        : ${__maxlen:=229}
+        : ${_maxlen:=229}
     else
         : ${_maxlen:=30}
     fi