diff --git a/src/Service/BookFileSystemManager.php b/src/Service/BookFileSystemManager.php
index 292907c7..20fd4e7c 100644
--- a/src/Service/BookFileSystemManager.php
+++ b/src/Service/BookFileSystemManager.php
@@ -405,7 +405,7 @@ private function extractFromRarArchive(\SplFileInfo $bookFile, Book $book): Book
         sort($entries);
 
         $entries = array_values(array_filter($entries, static function ($entry) {
-            return str_ends_with($entry, '.jpg') || str_ends_with($entry, '.jpeg') || str_ends_with($entry, '.png');
+            return str_ends_with($entry, '.jpg') || str_ends_with($entry, '.JPG') || str_ends_with($entry, '.jpeg') || str_ends_with($entry, '.png');
         }));
         if (count($entries) === 0) {
             $this->logger->error('no errors');