diff --git a/src/librustdoc/html/static/css/rustdoc.css b/src/librustdoc/html/static/css/rustdoc.css
index 651f05284ff..df60018c5d8 100644
--- a/src/librustdoc/html/static/css/rustdoc.css
+++ b/src/librustdoc/html/static/css/rustdoc.css
@@ -1416,7 +1416,6 @@ pre.rust {
 }
 #source-sidebar {
 	width: 100%;
-	z-index: 1;
 	overflow: auto;
 }
 #source-sidebar > .title {