diff --git a/glib/gdataset.c b/glib/gdataset.c
index bec57d914..c18e13f06 100644
--- a/glib/gdataset.c
+++ b/glib/gdataset.c
@@ -1114,7 +1114,7 @@ g_datalist_id_update_atomic (GData **datalist,
       new_destroy = NULL;
     }
 
-  result = callback (key_id, &new_data, &new_destroy, user_data);
+  result = callback (&new_data, &new_destroy, user_data);
 
   if (data && !new_data)
     {
diff --git a/glib/gdatasetprivate.h b/glib/gdatasetprivate.h
index c53455a06..228133c5f 100644
--- a/glib/gdatasetprivate.h
+++ b/glib/gdatasetprivate.h
@@ -40,7 +40,6 @@ G_BEGIN_DECLS
 
 /*< private >
  * GDataListUpdateAtomicFunc:
- * @key_id: ID of the entry to update
  * @data: (inout) (nullable) (not optional): the existing data corresponding
  *   to @key_id, and return location for the new value for it
  * @destroy_notify: (inout) (nullable) (not optional): the existing destroy
@@ -52,8 +51,7 @@ G_BEGIN_DECLS
  *
  * Since: 2.80
  */
-typedef gpointer (*GDataListUpdateAtomicFunc) (GQuark key_id,
-                                               gpointer *data,
+typedef gpointer (*GDataListUpdateAtomicFunc) (gpointer *data,
                                                GDestroyNotify *destroy_notify,
                                                gpointer user_data);
 
diff --git a/glib/tests/dataset.c b/glib/tests/dataset.c
index e97545152..0b9c02a3f 100644
--- a/glib/tests/dataset.c
+++ b/glib/tests/dataset.c
@@ -469,8 +469,7 @@ test_datalist_id_remove_multiple_destroy_order (void)
 }
 
 static gpointer
-_update_atomic_cb (GQuark key_id,
-                   gpointer *data,
+_update_atomic_cb (gpointer *data,
                    GDestroyNotify *destroy_notify,
                    gpointer user_data)
 {
diff --git a/gobject/gobject.c b/gobject/gobject.c
index d7f3d7a91..f73f3bf30 100644
--- a/gobject/gobject.c
+++ b/gobject/gobject.c
@@ -367,8 +367,7 @@ weak_ref_data_unlock (WeakRefData *wrdata)
 }
 
 static gpointer
-weak_ref_data_get_or_create_cb (GQuark key_id,
-                                gpointer *data,
+weak_ref_data_get_or_create_cb (gpointer *data,
                                 GDestroyNotify *destroy_notify,
                                 gpointer user_data)
 {