diff --git a/packages/netlify-cms-core/src/components/Collection/Sidebar.js b/packages/netlify-cms-core/src/components/Collection/Sidebar.js
index ea954921..db48511f 100644
--- a/packages/netlify-cms-core/src/components/Collection/Sidebar.js
+++ b/packages/netlify-cms-core/src/components/Collection/Sidebar.js
@@ -81,6 +81,7 @@ const SidebarNavLink = styled(NavLink)`
 
   ${Icon} {
     margin-right: 8px;
+    flex-shrink: 0;
   }
 
   ${props => css`