diff --git a/chrome/skin/default/zotero/bibliography.css b/chrome/skin/default/zotero/bibliography.css
index 84b6e5796c..368c841453 100644
--- a/chrome/skin/default/zotero/bibliography.css
+++ b/chrome/skin/default/zotero/bibliography.css
@@ -1,6 +1,6 @@
 #style-listbox
 {
-	height: 14em;
+	height: 14rem;
 	width: 325pt;
 }