diff --git a/wagtail/models/__init__.py b/wagtail/models/__init__.py
index 26e00c01c9..b424cad37b 100644
--- a/wagtail/models/__init__.py
+++ b/wagtail/models/__init__.py
@@ -112,7 +112,7 @@ from .media import (  # noqa: F401
     UploadedFile,
     get_root_collection_id,
 )
-from .orderable import Orderable
+from .orderable import Orderable  # noqa: F401
 from .panels import CommentPanelPlaceholder, PanelPlaceholder
 from .preview import PreviewableMixin
 from .reference_index import ReferenceIndex  # noqa: F401
@@ -133,6 +133,7 @@ from .workflows import (  # noqa: F401
     WorkflowState,
     WorkflowStateManager,
     WorkflowStateQuerySet,
+    WorkflowTask,
 )
 
 logger = logging.getLogger("wagtail")
@@ -2703,27 +2704,6 @@ class WorkflowPage(models.Model):
         verbose_name_plural = _("workflow pages")
 
 
-class WorkflowTask(Orderable):
-    workflow = ParentalKey(
-        "Workflow",
-        on_delete=models.CASCADE,
-        verbose_name=_("workflow_tasks"),
-        related_name="workflow_tasks",
-    )
-    task = models.ForeignKey(
-        "Task",
-        on_delete=models.CASCADE,
-        verbose_name=_("task"),
-        related_name="workflow_tasks",
-        limit_choices_to={"active": True},
-    )
-
-    class Meta(Orderable.Meta):
-        unique_together = [("workflow", "task")]
-        verbose_name = _("workflow task order")
-        verbose_name_plural = _("workflow task orders")
-
-
 class TaskQuerySet(SpecificQuerySetMixin, models.QuerySet):
     def active(self):
         return self.filter(active=True)
diff --git a/wagtail/models/workflows.py b/wagtail/models/workflows.py
index c5e959799e..c320c7d1c6 100644
--- a/wagtail/models/workflows.py
+++ b/wagtail/models/workflows.py
@@ -7,6 +7,7 @@ from django.db.models import Q
 from django.db.models.expressions import OuterRef, Subquery
 from django.utils.module_loading import import_string
 from django.utils.translation import gettext_lazy as _
+from modelcluster.fields import ParentalKey
 from modelcluster.models import (
     ClusterableModel,
 )
@@ -21,6 +22,7 @@ from wagtail.signals import (
 )
 
 from .locking import LockableMixin
+from .orderable import Orderable
 from .revisions import Revision
 
 
@@ -616,3 +618,24 @@ class AbstractWorkflow(ClusterableModel):
 
 class Workflow(AbstractWorkflow):
     pass
+
+
+class WorkflowTask(Orderable):
+    workflow = ParentalKey(
+        "Workflow",
+        on_delete=models.CASCADE,
+        verbose_name=_("workflow_tasks"),
+        related_name="workflow_tasks",
+    )
+    task = models.ForeignKey(
+        "Task",
+        on_delete=models.CASCADE,
+        verbose_name=_("task"),
+        related_name="workflow_tasks",
+        limit_choices_to={"active": True},
+    )
+
+    class Meta(Orderable.Meta):
+        unique_together = [("workflow", "task")]
+        verbose_name = _("workflow task order")
+        verbose_name_plural = _("workflow task orders")