diff --git a/combo/settings.py b/combo/settings.py
index 20a6e53b..8823a42b 100644
--- a/combo/settings.py
+++ b/combo/settings.py
@@ -190,6 +190,7 @@ HAYSTACK_CONNECTIONS = {
 
 # from solr.thumbnail -- https://sorl-thumbnail.readthedocs.io/en/latest/reference/settings.html
 THUMBNAIL_PRESERVE_FORMAT = True
+THUMBNAIL_FORCE_OVERWRITE = False
 
 COMBO_DEFAULT_PUBLIC_TEMPLATE = 'standard'
 COMBO_PUBLIC_TEMPLATES = {