diff --git a/seahub/settings.py b/seahub/settings.py
index 5351266dd5..c4f50eb163 100644
--- a/seahub/settings.py
+++ b/seahub/settings.py
@@ -537,7 +537,7 @@ THUMBNAIL_SIZE_FOR_GRID = 192
 THUMBNAIL_SIZE_FOR_ORIGINAL = 1024
 
 # size(MB) limit for generate thumbnail
-THUMBNAIL_IMAGE_SIZE_LIMIT = 20
+THUMBNAIL_IMAGE_SIZE_LIMIT = 30
 THUMBNAIL_IMAGE_ORIGINAL_SIZE_LIMIT = 256
 
 # video thumbnails