diff --git a/C4/Auth.pm b/C4/Auth.pm
index 9dba387e92..3c0b804a2c 100644
--- a/C4/Auth.pm
+++ b/C4/Auth.pm
@@ -1024,6 +1024,7 @@ sub checkauth {
         PatronSelfRegistration => C4::Context->preference("PatronSelfRegistration"),
         PatronSelfRegistrationDefaultCategory => C4::Context->preference("PatronSelfRegistrationDefaultCategory"),
         persona            => C4::Context->preference("Persona"),
+        opac_css_override => $ENV{'OPAC_CSS_OVERRIDE'},
     );
 
     $template->param( OpacPublic => C4::Context->preference("OpacPublic"));