diff --git a/Library/Homebrew/utils/analytics.rb b/Library/Homebrew/utils/analytics.rb
index a89995ba93..2e59b8f009 100644
--- a/Library/Homebrew/utils/analytics.rb
+++ b/Library/Homebrew/utils/analytics.rb
@@ -3,6 +3,10 @@ require "erb"
 module Utils
   module Analytics
     class << self
+      def clear_anonymous_os_prefix_ci_cache
+        remove_instance_variable(:@anonymous_os_prefix_ci) if instance_variable_defined?(:@anonymous_os_prefix_ci)
+      end
+
       def os_prefix_ci
         @anonymous_os_prefix_ci ||= begin
           os = OS_VERSION