diff --git a/Library/Homebrew/formula.rb b/Library/Homebrew/formula.rb
index cc25c2482c..2f25a5c304 100644
--- a/Library/Homebrew/formula.rb
+++ b/Library/Homebrew/formula.rb
@@ -212,6 +212,10 @@ class Formula
     active_spec.deprecated_options
   end
 
+  def deprecated_flags
+    active_spec.deprecated_flags
+  end
+
   # If a named option is defined for the currently active {SoftwareSpec}.
   def option_defined?(name)
     active_spec.option_defined?(name)
diff --git a/Library/Homebrew/formula_installer.rb b/Library/Homebrew/formula_installer.rb
index 7cca750764..3515c66de3 100644
--- a/Library/Homebrew/formula_installer.rb
+++ b/Library/Homebrew/formula_installer.rb
@@ -154,7 +154,7 @@ class FormulaInstaller
       raise "Unrecognized architecture for --bottle-arch: #{arch}"
     end
 
-    formula.active_spec.deprecated_flags.each do |deprecated_option|
+    formula.deprecated_flags.each do |deprecated_option|
       old_flag = deprecated_option.old_flag
       new_flag = deprecated_option.current_flag
       opoo "#{formula.name}: #{old_flag} was deprecated; using #{new_flag} instead!"