diff --git a/bin/brew b/bin/brew
index ed410fa7ab..77b2f59bb0 100755
--- a/bin/brew
+++ b/bin/brew
@@ -77,7 +77,7 @@ begin
   elsif require? `/usr/bin/which brew-#{cmd}.rb`
     exit 0
   elsif require? HOMEBREW_REPOSITORY/"Library/Homebrew/cmd"/cmd
-    Homebrew.send cmd.to_s.gsub('-', '_')
+    Homebrew.send cmd.to_s.gsub('-', '_').downcase
   else
     onoe "Unknown command: #{cmd}"
     exit 1