diff --git a/game/scripts/cg/luna.rpy b/game/scripts/cg/luna.rpy
index 134233cf..2d728601 100644
--- a/game/scripts/cg/luna.rpy
+++ b/game/scripts/cg/luna.rpy
@@ -350,9 +350,9 @@ layeredimage lun_grind:
 image lun_grind_border:
     fit "contain"
 
-    HBox("interface/frames/cg_frame.png",
+    HBox("interface/frames/cg_frame.webp",
         Null(2878, 3840),
-        Transform("interface/frames/cg_frame.png", xzoom=-1))
+        Transform("interface/frames/cg_frame.webp", xzoom=-1))
 
 image lun_grind_idle:
     Fixed(