diff --git a/app/models/concerns/canonical_email.rb b/app/models/concerns/canonical_email.rb
index 69d00a804cf..0a1d94ebb1d 100644
--- a/app/models/concerns/canonical_email.rb
+++ b/app/models/concerns/canonical_email.rb
@@ -4,13 +4,6 @@ module CanonicalEmail
   extend ActiveSupport::Concern
 
   class_methods do
-    def email_to_canonical_email(str)
-      username, domain = str.downcase.split('@', 2)
-      username, = username.delete('.').split('+', 2)
-
-      "#{username}@#{domain}"
-    end
-
     def email_to_canonical_email_hash(str)
       Digest::SHA2
         .new(256)
@@ -18,5 +11,14 @@ module CanonicalEmail
           email_to_canonical_email(str)
         )
     end
+
+    private
+
+    def email_to_canonical_email(str)
+      username, domain = str.downcase.split('@', 2)
+      username, = username.delete('.').split('+', 2)
+
+      "#{username}@#{domain}"
+    end
   end
 end