diff --git a/modules/ui.py b/modules/ui.py
index 4331a454d..22ee5a296 100644
--- a/modules/ui.py
+++ b/modules/ui.py
@@ -14,6 +14,7 @@ import modules.errors
 modules.errors.install()
 mimetypes.init()
 mimetypes.add_type('application/javascript', '.js')
+mimetypes.add_type('image/webp', '.webp')
 log = shared.log
 opts = shared.opts
 cmd_opts = shared.cmd_opts