diff --git a/lib/sanitize_ext/sanitize_config.rb b/lib/sanitize_ext/sanitize_config.rb
index 946543868a..be47818709 100644
--- a/lib/sanitize_ext/sanitize_config.rb
+++ b/lib/sanitize_ext/sanitize_config.rb
@@ -31,6 +31,7 @@ class Sanitize
         next true if /^(h|p|u|dt|e)-/.match?(e) # microformats classes
         next true if /^(mention|hashtag)$/.match?(e) # semantic classes
         next true if /^(ellipsis|invisible)$/.match?(e) # link formatting classes
+        next true if /^quote-inline$/.match?(e) # quote inline classes
       end
 
       node['class'] = class_list.join(' ')