diff --git a/clutter/clutter/clutter-event-private.h b/clutter/clutter/clutter-event-private.h
index 35740c9b7..52c451638 100644
--- a/clutter/clutter/clutter-event-private.h
+++ b/clutter/clutter/clutter-event-private.h
@@ -64,6 +64,7 @@ ClutterEvent * clutter_event_scroll_discrete_new (ClutterEventFlags       flags,
                                                   ClutterInputDeviceTool *tool,
                                                   ClutterModifierType     modifiers,
                                                   graphene_point_t        coords,
+                                                  ClutterScrollSource     scroll_source,
                                                   ClutterScrollDirection  direction);
 CLUTTER_EXPORT
 ClutterEvent * clutter_event_crossing_new (ClutterEventType      type,
diff --git a/clutter/clutter/clutter-event.c b/clutter/clutter/clutter-event.c
index 7723c8504..d204574d0 100644
--- a/clutter/clutter/clutter-event.c
+++ b/clutter/clutter/clutter-event.c
@@ -2017,6 +2017,7 @@ clutter_event_scroll_discrete_new (ClutterEventFlags       flags,
                                    ClutterInputDeviceTool *tool,
                                    ClutterModifierType     modifiers,
                                    graphene_point_t        coords,
+                                   ClutterScrollSource     scroll_source,
                                    ClutterScrollDirection  direction)
 {
   ClutterEvent *event;
@@ -2031,6 +2032,7 @@ clutter_event_scroll_discrete_new (ClutterEventFlags       flags,
   event->scroll.x = coords.x;
   event->scroll.y = coords.y;
   event->scroll.direction = direction;
+  event->scroll.scroll_source = scroll_source;
   event->scroll.modifier_state = modifiers;
   event->scroll.tool = tool;
 
diff --git a/src/backends/native/meta-seat-impl.c b/src/backends/native/meta-seat-impl.c
index 87bf15c7b..8bb9bd05e 100644
--- a/src/backends/native/meta-seat-impl.c
+++ b/src/backends/native/meta-seat-impl.c
@@ -990,6 +990,7 @@ notify_discrete_scroll (ClutterInputDevice     *input_device,
                                        NULL,
                                        modifiers,
                                        GRAPHENE_POINT_INIT (x, y),
+                                       scroll_source,
                                        direction);
 
   queue_event (seat_impl, event);
diff --git a/src/backends/x11/meta-seat-x11.c b/src/backends/x11/meta-seat-x11.c
index 0560a0d77..e76a9d046 100644
--- a/src/backends/x11/meta-seat-x11.c
+++ b/src/backends/x11/meta-seat-x11.c
@@ -2378,6 +2378,7 @@ meta_seat_x11_translate_event (MetaSeatX11  *seat,
                                                        tool,
                                                        state,
                                                        GRAPHENE_POINT_INIT (x, y),
+                                                       CLUTTER_SCROLL_SOURCE_UNKNOWN,
                                                        scroll_direction);
 
             g_debug ("scroll: win:0x%x, device:%d '%s', time:%d "