diff --git a/admission.py b/admission.py
index 002b85a..250843b 100644
--- a/admission.py
+++ b/admission.py
@@ -26,7 +26,7 @@ def webhook_online(stream) -> None:
     data = {"username": f"{config.WEBHOOK_NAME} Online", "content": config.WEBHOOK_ONLINE}
 
     if config.is_avatar_ready():
-        target_av = f"{stream[1]}/{stream[2]}.png"
+        target_av = f"{stream[1]}/{stream[2]}.png".lower()
         avatar = target_av if Path(config.WEBHOOK_AVATAR_PATH, target_av).is_file() else "default.png"
         data["avatar_url"] = f"{config.WEBHOOK_AVATAR_URL}/{avatar}"