diff --git a/umap/static/umap/js/umap.forms.js b/umap/static/umap/js/umap.forms.js
index 0d983e67..bf9dcdf7 100644
--- a/umap/static/umap/js/umap.forms.js
+++ b/umap/static/umap/js/umap.forms.js
@@ -854,10 +854,10 @@ L.FormBuilder.Range = L.FormBuilder.Input.extend({
     datalist.id = `range-${this.options.label || this.name}`
     this.input.setAttribute('list', datalist.id)
     let options = ''
+    const step = this.options.step || 1,
+      digits = step < 1 ? 2 : 0
     for (let i = this.options.min; i <= this.options.max; i += this.options.step) {
-      options += `<option value="${i.toPrecision(2)}" label="${i.toPrecision(
-        2
-      )}"></option>`
+      options += `<option value="${i.toFixed(digits)}" label="${i.toFixed(digits)}"></option>`
     }
     datalist.innerHTML = options
   },