diff --git a/addon/www/rest.cgi b/addon/www/rest.cgi
index 1f02bd5..4f8cdd7 100644
--- a/addon/www/rest.cgi
+++ b/addon/www/rest.cgi
@@ -234,7 +234,7 @@ variable content_type "application/json"
 
 if [catch {process} result] {
 	set status 500
-	if { $errorCode != "NONE" } {
+	if { [regexp {^\d+$} $errorCode ] } {
 		set status $errorCode
 	}
 	puts "Content-Type: ${content_type}"