diff --git a/async-bot.py b/async-bot.py
index 1d19f7a..1da6f66 100644
--- a/async-bot.py
+++ b/async-bot.py
@@ -72,7 +72,7 @@ class AsyncBotManager:
             alpha = im.convert("L").filter(ImageFilter.MaxFilter(5))
             im.putalpha(alpha)
             if negative:
-                im = ImageChops.invert(im)
+                im = ImageChops.invert(im.convert("RGBA")).convert("LA")
             return im.copy()
 
     def get_font(self, font_name: str, size: int = 8):