diff --git a/activesupport/lib/active_support/notifications/instrumenter.rb b/activesupport/lib/active_support/notifications/instrumenter.rb
index a721187d2d..125c06f37a 100644
--- a/activesupport/lib/active_support/notifications/instrumenter.rb
+++ b/activesupport/lib/active_support/notifications/instrumenter.rb
@@ -56,8 +56,9 @@ class Event
 
       def self.clock_gettime_supported? # :nodoc:
         defined?(Process::CLOCK_PROCESS_CPUTIME_ID) &&
-        !Gem.win_platform?
+          !Gem.win_platform?
       end
+      private_class_method :clock_gettime_supported?
 
       def initialize(name, start, ending, transaction_id, payload)
         @name           = name