diff --git a/lib/generators/nested_form/templates/jquery_nested_form.js b/lib/generators/nested_form/templates/jquery_nested_form.js
index 669fabf9..c893a73b 100644
--- a/lib/generators/nested_form/templates/jquery_nested_form.js
+++ b/lib/generators/nested_form/templates/jquery_nested_form.js
@@ -6,7 +6,7 @@ jQuery(function($) {
 
     // Make the context correct by replacing new_<parents> with the generated ID
     // of each of the parent objects
-    var context = ($(this).closest('.fields').find('input:first').attr('name') || '').replace(new RegExp('\[[a-z]+\]$'), '');
+    var context = ($(this).closest('.fields').find('input:first').attr('name') || '').replace(new RegExp('\[[a-z_]+\]$'), '');
 
     // context will be something like this for a brand new form:
     // project[tasks_attributes][new_1255929127459][assignments_attributes][new_1255929128105]