diff --git a/src/apprt/gtk/class/application.zig b/src/apprt/gtk/class/application.zig
index c951cc6ac..be0f3f2c8 100644
--- a/src/apprt/gtk/class/application.zig
+++ b/src/apprt/gtk/class/application.zig
@@ -741,6 +741,7 @@ pub const Application = extern struct {
             .close_all_windows,
             .float_window,
             .toggle_visibility,
+            .toggle_background_opacity,
             .cell_size,
             .key_sequence,
             .render_inspector,