diff --git a/src/Drivers/Imagick/Encoders/AvifEncoder.php b/src/Drivers/Imagick/Encoders/AvifEncoder.php
index f1aef7170..0cc856042 100644
--- a/src/Drivers/Imagick/Encoders/AvifEncoder.php
+++ b/src/Drivers/Imagick/Encoders/AvifEncoder.php
@@ -12,7 +12,7 @@ class AvifEncoder extends AbstractEncoder implements EncoderInterface
 {
     public function encode(ImageInterface $image): EncodedImage
     {
-        $format = 'avif';
+        $format = 'AVIF';
         $compression = Imagick::COMPRESSION_ZIP;
 
         $imagick = $image->getFrame()->getCore();