diff --git a/app/assets/javascripts/wizard/templates/components/wizard-field-dropdown.hbs b/app/assets/javascripts/wizard/templates/components/wizard-field-dropdown.hbs
index 5b52ef9f19d..7a59b1fda84 100644
--- a/app/assets/javascripts/wizard/templates/components/wizard-field-dropdown.hbs
+++ b/app/assets/javascripts/wizard/templates/components/wizard-field-dropdown.hbs
@@ -5,5 +5,5 @@
   content=field.choices
   nameProperty="label"
   tabindex="9"
-  onChange=(mut field.value)
+  onChange=(fn (mut field.value))
 }}