diff --git a/css/eupt.custom.css b/css/eupt.custom.css
index 82a8dd350b775549b0fda76e5f61c81e0a635149..dae4b6ba69b26628a0f7b96ca3e68709587fb52c 100644
--- a/css/eupt.custom.css
+++ b/css/eupt.custom.css
@@ -1081,7 +1081,7 @@ philology unit[xml|id]::after(2) {
 
 
 bibl {
-    -oxy-link: "https://www.zotero.org/groups/5113405/eupt/collections/WDM6KU22/items/" oxy_substring(attr(zotero), 5) ;
+    -oxy-link: oxy_xpath("data(//header//zotero[@prefix='eupt']/@xml:base)") oxy_substring(attr(zotero), 5) ; 
     text-decoration-color: blue;
     text-decoration: underline;
 }