diff --git a/app/helpers/smoke_detectors_helper.rb b/app/helpers/smoke_detectors_helper.rb
index d3cf75961..f55cd530d 100644
--- a/app/helpers/smoke_detectors_helper.rb
+++ b/app/helpers/smoke_detectors_helper.rb
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 module SmokeDetectorsHelper
-  def escape_markdown(s)
+  def self.escape_markdown(s)
     %w{[ ] * _ `}.each do |token|
       s = s.gsub token, '\\' + token
     end