diff --git a/wagtail/wagtailadmin/templates/wagtailadmin/block_forms/sequence_member.html b/wagtail/wagtailadmin/templates/wagtailadmin/block_forms/sequence_member.html
index 6e914fcdfa..12f2e6d558 100644
--- a/wagtail/wagtailadmin/templates/wagtailadmin/block_forms/sequence_member.html
+++ b/wagtail/wagtailadmin/templates/wagtailadmin/block_forms/sequence_member.html
@@ -12,7 +12,7 @@
 
 
 {% endcomment %}
-<li id="{{ prefix }}-container" class="sequence-member blockname-{{ block_type_name }}">
+<li id="{{ prefix }}-container" class="sequence-member">
     <input type="hidden" id="{{ prefix }}-deleted" name="{{ prefix }}-deleted" value="">
     <input type="hidden" id="{{ prefix }}-order" name="{{ prefix }}-order" value="{{ index }}">
     
diff --git a/wagtail/wagtailadmin/tests/test_pages_views.py b/wagtail/wagtailadmin/tests/test_pages_views.py
index 823169cc73..cd694b93b3 100644
--- a/wagtail/wagtailadmin/tests/test_pages_views.py
+++ b/wagtail/wagtailadmin/tests/test_pages_views.py
@@ -3448,7 +3448,7 @@ class TestInlineStreamField(TestCase, WagtailTestUtils):
         self.assertEqual(response.status_code, 200)
 
         # response should include HTML declarations for streamfield child blocks
-        self.assertContains(response, '<li id="__PREFIX__-container" class="sequence-member blockname-rich_text">')
+        self.assertContains(response, '<li id="__PREFIX__-container" class="sequence-member">')
 
 
 class TestRecentEditsPanel(TestCase, WagtailTestUtils):