diff --git a/client.h b/client.h
index ca5fbd6c..43e901d5 100644
--- a/client.h
+++ b/client.h
@@ -313,6 +313,13 @@ static inline void client_set_fullscreen(Client *c, int fullscreen) {
   wlr_xdg_toplevel_set_fullscreen(c->surface.xdg->toplevel, fullscreen);
 }
 
+static inline void
+client_set_scale(struct wlr_surface *s, float scale)
+{
+	wlr_fractional_scale_v1_notify_scale(s, scale);
+	wlr_surface_set_preferred_buffer_scale(s, (int32_t)ceilf(scale));
+}
+
 static inline uint32_t client_set_size(Client *c, uint32_t width,
                                        uint32_t height) {
 #ifdef XWAYLAND
diff --git a/maomao.c b/maomao.c
index a21289d8..7e17bdd9 100644
--- a/maomao.c
+++ b/maomao.c
@@ -12,6 +12,7 @@
 #include <sys/wait.h>
 #include <time.h>
 #include <unistd.h>
+#include <wlr/types/wlr_fractional_scale_v1.h>
 #include <wayland-server-core.h>
 #include <wlr/backend.h>
 #include <wlr/backend/libinput.h>