diff --git a/django/forms/jinja2/django/forms/widgets/multiple_input.html b/django/forms/jinja2/django/forms/widgets/multiple_input.html
index be3d449926..349db54104 100644
--- a/django/forms/jinja2/django/forms/widgets/multiple_input.html
+++ b/django/forms/jinja2/django/forms/widgets/multiple_input.html
@@ -1,5 +1,5 @@
 {% set id = widget.attrs.id %}<ul{% if id %} id="{{ id }}"{% endif %}>{% for group, options, index in widget.optgroups %}{% if group %}
-  <li>{{ group }}<ul{% if id %} id="{{ id }}_{{ index }}{% endif %}">{% endif %}{% for widget in options %}
+  <li>{{ group }}<ul{% if id %} id="{{ id }}_{{ index }}"{% endif %}>{% endif %}{% for widget in options %}
     <li>{% include widget.template_name %}</li>{% endfor %}{% if group %}
   </ul></li>{% endif %}{% endfor %}
 </ul>
diff --git a/django/forms/templates/django/forms/widgets/multiple_input.html b/django/forms/templates/django/forms/widgets/multiple_input.html
index 60282ff887..2362aff4e6 100644
--- a/django/forms/templates/django/forms/widgets/multiple_input.html
+++ b/django/forms/templates/django/forms/widgets/multiple_input.html
@@ -1,5 +1,5 @@
 {% with id=widget.attrs.id %}<ul{% if id %} id="{{ id }}"{% endif %}>{% for group, options, index in widget.optgroups %}{% if group %}
-  <li>{{ group }}<ul{% if id %} id="{{ id }}_{{ index }}{% endif %}">{% endif %}{% for option in options %}
+  <li>{{ group }}<ul{% if id %} id="{{ id }}_{{ index }}"{% endif %}>{% endif %}{% for option in options %}
     <li>{% include option.template_name with widget=option %}</li>{% endfor %}{% if group %}
   </ul></li>{% endif %}{% endfor %}
 </ul>{% endwith %}
diff --git a/tests/forms_tests/widget_tests/test_checkboxselectmultiple.py b/tests/forms_tests/widget_tests/test_checkboxselectmultiple.py
index a92e5533e2..6ec5c78803 100644
--- a/tests/forms_tests/widget_tests/test_checkboxselectmultiple.py
+++ b/tests/forms_tests/widget_tests/test_checkboxselectmultiple.py
@@ -78,6 +78,41 @@ class CheckboxSelectMultipleTest(WidgetTest):
             attrs={'id': 'media'}, html=html,
         )
 
+    def test_nested_choices_without_id(self):
+        nested_choices = (
+            ('unknown', 'Unknown'),
+            ('Audio', (('vinyl', 'Vinyl'), ('cd', 'CD'))),
+            ('Video', (('vhs', 'VHS'), ('dvd', 'DVD'))),
+        )
+        html = """
+        <ul>
+        <li>
+        <label><input name="nestchoice" type="checkbox" value="unknown" /> Unknown</label>
+        </li>
+        <li>Audio<ul>
+        <li>
+        <label>
+        <input checked name="nestchoice" type="checkbox" value="vinyl" /> Vinyl
+        </label>
+        </li>
+        <li>
+        <label><input name="nestchoice" type="checkbox" value="cd" /> CD</label>
+        </li>
+        </ul></li>
+        <li>Video<ul>
+        <li>
+        <label><input name="nestchoice" type="checkbox" value="vhs" /> VHS</label>
+        </li>
+        <li>
+        <label>
+        <input checked name="nestchoice" type="checkbox" value="dvd" /> DVD
+        </label>
+        </li>
+        </ul></li>
+        </ul>
+        """
+        self.check_html(self.widget(choices=nested_choices), 'nestchoice', ('vinyl', 'dvd'), html=html)
+
     def test_separate_ids(self):
         """
         Each input gets a separate ID.