diff --git a/app/controllers/concerns/view_component/preview_actions.rb b/app/controllers/concerns/view_component/preview_actions.rb
index f27d175e6..407e05b7d 100644
--- a/app/controllers/concerns/view_component/preview_actions.rb
+++ b/app/controllers/concerns/view_component/preview_actions.rb
@@ -14,7 +14,12 @@ module PreviewActions
 
       # Including helpers here ensures that we're loading the
       # latest version of helpers if code-reloading is enabled
-      helper :all if include_all_helpers
+      if include_all_helpers
+        helper :all
+      else
+        # Always provide the #view_source helper
+        helper PreviewHelper
+      end
     end
 
     def index