diff --git a/wagtail/core/fields.py b/wagtail/core/fields.py
index e19328eb5c..cc9477d55c 100644
--- a/wagtail/core/fields.py
+++ b/wagtail/core/fields.py
@@ -4,7 +4,7 @@ from django.core.serializers.json import DjangoJSONEncoder
 from django.db import models
 from django.utils.encoding import force_str
 
-from wagtail.core.blocks import Block, BlockField, StreamBlock, StreamValue, StructValue
+from wagtail.core.blocks import Block, BlockField, StreamBlock, StreamValue
 from wagtail.core.rich_text import get_text_for_indexing