diff --git a/PluralKit.Bot/Utils/AvatarUtils.cs b/PluralKit.Bot/Utils/AvatarUtils.cs
index 70206593..0f6d314c 100644
--- a/PluralKit.Bot/Utils/AvatarUtils.cs
+++ b/PluralKit.Bot/Utils/AvatarUtils.cs
@@ -63,7 +63,7 @@ public static class AvatarUtils
     // This lets us add resizing parameters to "borrow" their media proxy server to downsize the image
     // which in turn makes it more likely to be underneath the size limit!
     private static readonly Regex DiscordCdnUrl =
-        new(@"^https?://(?:cdn\.discordapp\.com|media\.discordapp\.net)/attachments/(\d{17,19})/(\d{17,19})/([^/\\&\?]+)\.(png|jpg|jpeg|webp)(?:\?(?<query>.*))?$");
+        new(@"^https?://(?:cdn\.discordapp\.com|media\.discordapp\.net)/attachments/(\d{17,19})/(\d{17,19})/([^/\\&\?]+)\.(png|jpe?g|webp)(?:\?(?<query>.*))?$", RegexOptions.IgnoreCase);
 
     private static readonly string DiscordMediaUrlReplacement =
         "https://media.discordapp.net/attachments/$1/$2/$3.$4?width=256&height=256";