diff --git a/app/views/compare/_form.html.haml b/app/views/compare/_form.html.haml
index 088b6ad9158..123c1c457f8 100644
--- a/app/views/compare/_form.html.haml
+++ b/app/views/compare/_form.html.haml
@@ -13,7 +13,8 @@
= text_field_tag :from, params[:from], placeholder: "master", class: "xlarge"
= "..."
= text_field_tag :to, params[:to], placeholder: "aa8b4ef", class: "xlarge"
- = link_to 'switch', {from: params[:to], to: params[:from]}, {class: 'commits-compare-switch has_tooltip', title: 'Switch base of comparison'}
+ - if params[:to] && params[:from]
+ = link_to 'switch', {from: params[:to], to: params[:from]}, {class: 'commits-compare-switch has_tooltip', title: 'Switch base of comparison'}
- if @refs_are_same
.alert
%span Refs are the same