diff --git a/plugins/webp-uploads/helper.php b/plugins/webp-uploads/helper.php
index 7f1d6aae27..7a49b402dc 100644
--- a/plugins/webp-uploads/helper.php
+++ b/plugins/webp-uploads/helper.php
@@ -373,7 +373,7 @@ function webp_uploads_mime_type_supported( string $mime_type ): bool {
 	// In certain server environments Image editors can report a false positive for AVIF support.
 	if ( 'image/avif' === $mime_type ) {
 		$editor = _wp_image_editor_choose( array( 'mime_type' => 'image/avif' ) );
-		if ( 'WP_Image_Editor_GD' === $editor ) {
+		if ( is_a( $editor, WP_Image_Editor_GD::class, true ) ) {
 			return function_exists( 'imageavif' );
 		}
 		if ( 'WP_Image_Editor_Imagick' === $editor ) {