diff --git a/client.h b/client.h
index a742631..38330d5 100644
--- a/client.h
+++ b/client.h
@@ -304,7 +304,7 @@ toplevel_from_popup(struct wlr_xdg_popup *popup)
 	while (1) {
 		switch (surface->role) {
 		case WLR_XDG_SURFACE_ROLE_POPUP:
-			if (surface->popup->parent == NULL)
+			if (!surface->popup->parent)
 				return NULL;
 			else if (wlr_surface_is_layer_surface(surface->popup->parent))
 				return wlr_layer_surface_v1_from_wlr_surface(surface->popup->parent)->data;