diff --git a/lemonldap-ng-portal/lib/Lemonldap/NG/Portal/Main/Display.pm b/lemonldap-ng-portal/lib/Lemonldap/NG/Portal/Main/Display.pm
index f3ea4965c..91044079e 100644
--- a/lemonldap-ng-portal/lib/Lemonldap/NG/Portal/Main/Display.pm
+++ b/lemonldap-ng-portal/lib/Lemonldap/NG/Portal/Main/Display.pm
@@ -186,6 +186,7 @@ sub display {
             %templateParams = (
                 %templateParams,
                 CAPTCHA_SRC  => $req->captcha,
+                CAPTCHA_SIZE => $self->{conf}->{captcha_size} || 6
             );
         }
         if ( $req->token ) {