diff --git a/doc/doxygen/custom.css b/doc/doxygen/custom.css
index 214ee2c3..226716b9 100644
--- a/doc/doxygen/custom.css
+++ b/doc/doxygen/custom.css
@@ -75,6 +75,10 @@ span.permalink a {
 }
 
 
+#nav-sync {
+    display: none;
+}
+
 #nav-tree,
 div.header,
 .ui-resizable-e,