diff --git a/Library/Homebrew/cmd/audit.rb b/Library/Homebrew/cmd/audit.rb
index ca4b8ad59b..b6423de374 100755
--- a/Library/Homebrew/cmd/audit.rb
+++ b/Library/Homebrew/cmd/audit.rb
@@ -170,6 +170,7 @@ def audit_formula_options f, text
   if documented_options.length > 0
     documented_options.each do |o|
       next if o == '--universal' and text =~ /ARGV\.build_universal\?/
+      next if o == '--32-bit' and text =~ /ARGV\.build_32_bit\?/
       problems << " * Option #{o} is unused" unless options.include? o
     end
   end