diff --git a/Library/Homebrew/extend/time.rb b/Library/Homebrew/extend/time.rb
index 81779cd8dc..1fee2d4bd3 100644
--- a/Library/Homebrew/extend/time.rb
+++ b/Library/Homebrew/extend/time.rb
@@ -16,3 +16,8 @@ module TimeRemaining
     end
   end
 end
+
+class Time
+  # Backwards compatibility for formulae that used this ActiveSupport extension
+  alias rfc3339 xmlschema
+end