diff --git a/chrome/skin/default/zotero/bindings/guidancepanel.css b/chrome/skin/default/zotero/bindings/guidancepanel.css
index 97eb0acefe..52fabaa4d7 100644
--- a/chrome/skin/default/zotero/bindings/guidancepanel.css
+++ b/chrome/skin/default/zotero/bindings/guidancepanel.css
@@ -10,6 +10,7 @@ stack {
 }
 
 *[anonid=nav-buttons] > toolbarbutton {
+	-moz-appearance: none; /* Necessary on Linux for button to be shown */
 	width: 22px;
 	height: 22px;
 	border: 1px solid lightgray;