diff --git a/_generator_lists/bad-user-agents.list b/_generator_lists/bad-user-agents.list
index 5019fd4b9..0b4db525a 100755
--- a/_generator_lists/bad-user-agents.list
+++ b/_generator_lists/bad-user-agents.list
@@ -1,3 +1,4 @@
+Thumbor
 360Spider
 404checker
 404enemy