diff --git a/wagtail/admin/tests/pages/test_explorer_view.py b/wagtail/admin/tests/pages/test_explorer_view.py
index f4bd5e0102..0e9ee4d6a0 100644
--- a/wagtail/admin/tests/pages/test_explorer_view.py
+++ b/wagtail/admin/tests/pages/test_explorer_view.py
@@ -1284,7 +1284,7 @@ class TestInWorkflowStatus(WagtailTestUtils, TestCase):
         # Warm up cache
         self.client.get(self.url)
 
-        with self.assertNumQueries(47):
+        with self.assertNumQueries(44):
             response = self.client.get(self.url)
 
         self.assertEqual(response.status_code, 200)
diff --git a/wagtail/models/__init__.py b/wagtail/models/__init__.py
index d00c27e160..93a7388717 100644
--- a/wagtail/models/__init__.py
+++ b/wagtail/models/__init__.py
@@ -642,7 +642,7 @@ class DraftStateMixin(models.Model):
 
     def get_lock(self):
         # Scheduled publishing lock should take precedence over other locks
-        if self.scheduled_revision:
+        if self.approved_schedule:
             return ScheduledForPublishLock(self)
         return super().get_lock()