diff --git a/umap/static/umap/js/umap.core.js b/umap/static/umap/js/umap.core.js
index 48c81524..5c42cde8 100644
--- a/umap/static/umap/js/umap.core.js
+++ b/umap/static/umap/js/umap.core.js
@@ -143,7 +143,7 @@ L.DomUtil.createButtonIcon = (parent, className, title, callback, size = 16) =>
 
 L.DomUtil.createTitle = (parent, text, iconClassName, className = '', tag = 'h3') => {
   const title = L.DomUtil.create(tag, '', parent)
-  if (className) L.DomUtil.createIcon(title, iconClassName)
+  if (iconClassName) L.DomUtil.createIcon(title, iconClassName)
   L.DomUtil.add('span', className, title, text)
   return title
 }