diff --git a/synapse/rest/media/v1/thumbnail_resource.py b/synapse/rest/media/v1/thumbnail_resource.py
index eee93b4313..d57480f761 100644
--- a/synapse/rest/media/v1/thumbnail_resource.py
+++ b/synapse/rest/media/v1/thumbnail_resource.py
@@ -331,7 +331,7 @@ class ThumbnailResource(DirectServeResource):
                             )
                         )
             if crop_info_list:
-                return min(crop_info_list2)[-1]
+                return min(crop_info_list)[-1]
             else:
                 return min(crop_info_list2)[-1]
         else: