diff --git a/Library/Homebrew/brewkit.rb b/Library/Homebrew/brewkit.rb
index 9cfc999af3..92cd3b65b9 100644
--- a/Library/Homebrew/brewkit.rb
+++ b/Library/Homebrew/brewkit.rb
@@ -116,6 +116,8 @@ ENV.extend HomebrewEnvExtension
 
 def inreplace(path, before, after)
   before=Regexp.escape before.to_s
+  before.gsub! "/", "\\/" # I guess not escaped as delimiter varies
+  after=after.to_s
   after.gsub! "\\", "\\\\"
   after.gsub! "/", "\\/"