diff --git a/src/adapter/localFolder.ts b/src/adapter/localFolder.ts
index c1bf973c..9a4c0a3e 100644
--- a/src/adapter/localFolder.ts
+++ b/src/adapter/localFolder.ts
@@ -98,7 +98,7 @@ class LocalFolderAdapter extends BaseAdapter {
             }
 
             const contentType = info.get_content_type();
-            if (contentType === 'image/png' || contentType === 'image/jpeg')
+            if (contentType && contentType.startsWith('image/'))
                 files.push(child);
         }