diff --git a/static/js/utils/form.js b/static/js/utils/form.js
index cb7cdd9f9..9c577725a 100644
--- a/static/js/utils/form.js
+++ b/static/js/utils/form.js
@@ -145,6 +145,7 @@
   var interactiveFieldsetUtil = function(element) {
     var conditionalInput;
     var conditionalValue;
+    var formGroup;
 
     function init() {
       if (!element) {
@@ -171,6 +172,11 @@
       }
       conditionalValue = element.dataset.conditionalValue;
 
+      formGroup = element.closest('.form-group');
+      if (!formGroup) {
+        throw new Error('Interactive Fieldset needs a .form-group ancestor!');
+      }
+
       // add event listener
       conditionalInput.addEventListener('input', updateVisibility);
 
@@ -188,7 +194,7 @@
     }
 
     function updateVisibility() {
-      element.classList.toggle('hidden', conditionalInput.value !== conditionalValue);
+      formGroup.classList.toggle('hidden', conditionalInput.value !== conditionalValue);
     }
 
     return init();