diff --git a/sway/tree/container.c b/sway/tree/container.c
index 92d9ce06..b6ff4d30 100644
--- a/sway/tree/container.c
+++ b/sway/tree/container.c
@@ -283,7 +283,7 @@ static struct sway_container *container_output_destroy(
 				container_remove_child(workspace);
 				if (!workspace_is_empty(workspace)) {
 					container_add_child(new_output, workspace);
-					ipc_event_workspace(workspace, NULL, "move");
+					ipc_event_workspace(NULL, workspace, "move");
 				} else {
 					container_destroy(workspace);
 				}
diff --git a/sway/tree/layout.c b/sway/tree/layout.c
index a0764a54..b833e8e1 100644
--- a/sway/tree/layout.c
+++ b/sway/tree/layout.c
@@ -217,7 +217,7 @@ void container_move_to(struct sway_container *container,
 		container_sort_workspaces(new_parent);
 		seat_set_focus(seat, new_parent);
 		workspace_output_raise_priority(container, old_parent, new_parent);
-		ipc_event_workspace(container, NULL, "move");
+		ipc_event_workspace(NULL, container, "move");
 	}
 	container_notify_subtree_changed(old_parent);
 	container_notify_subtree_changed(new_parent);
diff --git a/sway/tree/output.c b/sway/tree/output.c
index da535c18..31e3bf9b 100644
--- a/sway/tree/output.c
+++ b/sway/tree/output.c
@@ -22,7 +22,7 @@ static void restore_workspaces(struct sway_container *output) {
 			if (highest == output) {
 				container_remove_child(ws);
 				container_add_child(output, ws);
-				ipc_event_workspace(ws, NULL, "move");
+				ipc_event_workspace(NULL, ws, "move");
 				j--;
 			}
 		}