diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index f580ddc..5b591eb 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -7,6 +7,9 @@ Next version
 - Added the ``django-prose-editor[sanitize]`` which automatically installs the
   ``nh3`` dependency.
 - Properly restored the textarea element when destroying the editor.
+- Added more unittesting.
+- Supported using the ``ProseEditorFormField`` with widget instances, not just
+  with widget classes.
 
 
 0.6 (2024-07-26)
diff --git a/django_prose_editor/fields.py b/django_prose_editor/fields.py
index 1309084..7d735c8 100644
--- a/django_prose_editor/fields.py
+++ b/django_prose_editor/fields.py
@@ -56,9 +56,17 @@ class ProseEditorFormField(forms.CharField):
 
     def __init__(self, *args, **kwargs):
         config = kwargs.pop("config", {})
-
-        if (widget := kwargs.get("widget")) and issubclass(
-            widget, widgets.AdminTextareaWidget
+        widget = kwargs.get("widget")
+
+        # We don't know if widget is set, and if it is, we do not know if it is
+        # a class or an instance of the widget. The following if statement
+        # should take all possibilities into account.
+        if widget and (
+            (
+                isinstance(widget, type)
+                and issubclass(widget, widgets.AdminTextareaWidget)
+            )
+            or isinstance(widget, widgets.AdminTextareaWidget)
         ):
             kwargs["widget"] = AdminProseEditorWidget
         else:
diff --git a/tests/testapp/admin.py b/tests/testapp/admin.py
index e7818bd..f11e8da 100644
--- a/tests/testapp/admin.py
+++ b/tests/testapp/admin.py
@@ -1,7 +1,29 @@
+from django import forms
 from django.contrib import admin
 
+from django_prose_editor.widgets import ProseEditorWidget
 from testapp import models
 
 
-admin.register(models.ProseEditorModel)
-admin.register(models.SanitizedProseEditorModel)
+@admin.register(models.ProseEditorModel)
+class ProseEditorModelAdmin(admin.ModelAdmin):
+    pass
+
+
+class SanitizedProseEditorModelForm(forms.ModelForm):
+    class Meta:
+        widgets = {
+            "description": ProseEditorWidget(
+                config={
+                    "types": ["paragraph", "strong", "em", "link", "heading"],
+                    "history": False,
+                    "html": False,
+                    "typographic": True,
+                }
+            )
+        }
+
+
+@admin.register(models.SanitizedProseEditorModel)
+class SanitizedProseEditorModelAdmin(admin.ModelAdmin):
+    form = SanitizedProseEditorModelForm
diff --git a/tests/testapp/test_prose_editor.py b/tests/testapp/test_prose_editor.py
index 70d8174..ce5581b 100644
--- a/tests/testapp/test_prose_editor.py
+++ b/tests/testapp/test_prose_editor.py
@@ -1,4 +1,6 @@
 from django import test
+from django.contrib.auth.models import User
+from django.test import Client
 
 from testapp.models import ProseEditorModel, SanitizedProseEditorModel
 
@@ -35,3 +37,15 @@ def test_sanitized_field(self):
         m = SanitizedProseEditorModel(description="<p>hello</p>")
         m.full_clean()
         self.assertEqual(m.description, "<p>hello</p>")
+
+    def test_admin(self):
+        client = Client()
+        client.force_login(
+            User.objects.create_superuser("admin", "admin@example.com", "password")
+        )
+
+        response = client.get("/admin/testapp/proseeditormodel/add/")
+        # print(response, response.content.decode("utf-8"))
+        self.assertContains(
+            response, 'href="/static/django_prose_editor/overrides.css"'
+        )