diff --git a/mxrouter/mxrouterctl b/mxrouter/mxrouterctl
index 3c43140..93263e0 100755
--- a/mxrouter/mxrouterctl
+++ b/mxrouter/mxrouterctl
@@ -567,9 +567,10 @@ unless (-e $CONFIG_FILE) {
 	exit;
 }
 
-do $CONFIG_FILE;
-$@ and die "$CONFIG_FILE: $@\n";
-$! and die "$CONFIG_FILE: $!\n";
+unless (defined do "$CONFIG_FILE") {
+	die "$CONFIG_FILE: $@\n" if $@;
+	die "$CONFIG_FILE: $!\n";
+}
 
 sub dhcrelay_forward {
 	my ($ip)=@_;