diff --git a/lib/Thruk/Controller/rest_v1.pm b/lib/Thruk/Controller/rest_v1.pm
index 27b8510a5..52b4d66bd 100644
--- a/lib/Thruk/Controller/rest_v1.pm
+++ b/lib/Thruk/Controller/rest_v1.pm
@@ -1184,7 +1184,7 @@ sub _apply_sort {
         $key = $alias_columns->{$key} if defined $alias_columns->{$key};
 
         # check for nasty chars
-        die("sort key contains invalid characters") if($key =~ m/[`\$\(>'"]/mx);
+        die("sort key contains invalid characters") if($key =~ m/[`\$>'"]/mx);
 
         # sort numeric
         if( defined $data->[0]->{$key} and Thruk::Backend::Manager::looks_like_number($data->[0]->{$key}) ) {