diff --git a/lib/googleauth/helpers/connection.rb b/lib/googleauth/helpers/connection.rb
index a07a4b52..d7e5d354 100644
--- a/lib/googleauth/helpers/connection.rb
+++ b/lib/googleauth/helpers/connection.rb
@@ -22,7 +22,7 @@ module Auth
     module Helpers
       # Connection provides a Faraday connection for use with Google::Auth.
       module Connection
-        module_function
+        private
 
         attr_accessor :default_connection