diff --git a/Library/Homebrew/cmd/audit.rb b/Library/Homebrew/cmd/audit.rb
index 8244d40aac..b0efe040f5 100644
--- a/Library/Homebrew/cmd/audit.rb
+++ b/Library/Homebrew/cmd/audit.rb
@@ -233,6 +233,8 @@ class FormulaAuditor
         when :sha256 then 64
         end
 
+      problem "md5 is broken, deprecated: use sha1 instead" if cksum.hash_type == :md5
+
       if cksum.empty?
         problem "#{cksum.hash_type} is empty"
       else