diff --git a/CHANGES.rst b/CHANGES.rst
index ff48687b6..1f94f2a6d 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,5 +1,12 @@
 .. currentmodule:: wtforms
 
+Version 3.2.1
+-------------
+
+Unreleased
+
+- Fix :class:`~fields.SelectMultipleBase` import. :issue:`861` :pr:`862`
+
 Version 3.2.0
 -------------
 
diff --git a/src/wtforms/__init__.py b/src/wtforms/__init__.py
index 6074b673e..80cef2e9e 100644
--- a/src/wtforms/__init__.py
+++ b/src/wtforms/__init__.py
@@ -2,6 +2,7 @@
 from wtforms import widgets
 from wtforms.fields.choices import RadioField
 from wtforms.fields.choices import SelectField
+from wtforms.fields.choices import SelectFieldBase
 from wtforms.fields.choices import SelectMultipleField
 from wtforms.fields.core import Field
 from wtforms.fields.core import Flags
@@ -44,6 +45,7 @@
     "ValidationError",
     "SelectField",
     "SelectMultipleField",
+    "SelectFieldBase",
     "RadioField",
     "Field",
     "Flags",
diff --git a/src/wtforms/fields/__init__.py b/src/wtforms/fields/__init__.py
index 4d588a881..64fb6d391 100644
--- a/src/wtforms/fields/__init__.py
+++ b/src/wtforms/fields/__init__.py
@@ -1,5 +1,6 @@
 from wtforms.fields.choices import RadioField
 from wtforms.fields.choices import SelectField
+from wtforms.fields.choices import SelectFieldBase
 from wtforms.fields.choices import SelectMultipleField
 from wtforms.fields.core import Field
 from wtforms.fields.core import Flags
@@ -38,6 +39,7 @@
     "Label",
     "SelectField",
     "SelectMultipleField",
+    "SelectFieldBase",
     "RadioField",
     "DateTimeField",
     "DateField",