diff --git a/src/Http/FileUpload.php b/src/Http/FileUpload.php
index 7830a1e4..a63fc0ed 100644
--- a/src/Http/FileUpload.php
+++ b/src/Http/FileUpload.php
@@ -29,7 +29,7 @@ final class FileUpload
 {
 	use Nette\SmartObject;
 
-	public const ImageMimeTypes = ['image/gif', 'image/png', 'image/jpeg', 'image/webp'];
+	public const ImageMimeTypes = ['image/gif', 'image/png', 'image/jpeg', 'image/webp', 'image/avif'];
 
 	/** @deprecated use FileUpload::ImageMimeTypes */
 	public const IMAGE_MIME_TYPES = self::ImageMimeTypes;