diff --git a/stack/cas/connectorhelper.class.php b/stack/cas/connectorhelper.class.php
index e852509e0f4..284e9fb65fc 100644
--- a/stack/cas/connectorhelper.class.php
+++ b/stack/cas/connectorhelper.class.php
@@ -303,6 +303,7 @@ public static function stackmaxima_genuine_connect() {
                 'cte("STACKversion",errcatch(stackmaximaversion)), print("2=[ error= ["), ' .
                 'cte("MAXIMAversion",errcatch(MAXIMA_VERSION_STR)), print("3=[ error= ["), ' .
                 'cte("MAXIMAversionnum",errcatch(MAXIMA_VERSION_NUM)), print("4=[ error= ["), ' .
+                'cte("externalformat",errcatch(adjust_external_format())), print("5=[ error= ["), ' .
                 'cte("CAStime",errcatch(CAStime:"'.$date.'")), print("] ]"), return(true));' .
                 "\n";