diff --git a/perl-xCAT/xCAT/NetworkUtils.pm b/perl-xCAT/xCAT/NetworkUtils.pm
index 6f65ea2e2..ce6c82985 100755
--- a/perl-xCAT/xCAT/NetworkUtils.pm
+++ b/perl-xCAT/xCAT/NetworkUtils.pm
@@ -2188,7 +2188,7 @@ sub isValidHostname
     my ($class, $hostname) = @_;
     if ($hostname =~ /^[a-z0-9]/){
         if ($hostname =~ /[a-z0-9]$/){
-            if ($hostname =~ /[\-a-z0-9]+/){
+            if ($hostname =~ /^[\-a-z0-9]+$/){
                 return 1;
             }
         }