diff --git a/lib/default.php b/lib/default.php
index 2fd660e2ad..8fccb0a648 100644
--- a/lib/default.php
+++ b/lib/default.php
@@ -250,8 +250,8 @@ $default =
               'monthly_quota' => 15000000,
               'uploads' => true,
               'show_thumbs' => true, // show thumbnails in notice lists for uploaded images, and photos and videos linked remotely that provide oEmbed info
-              'thumb_width' => 100,
-              'thumb_height' => 75,
+              'thumb_width' => 150,
+              'thumb_height' => 150,
               'process_links' => true, // check linked resources for embeddable photos and videos; this will hit referenced external web sites when processing new messages.
               ),
         'application' =>