diff --git a/Formula/parsley.rb b/Formula/parsley.rb
index 433e503b09..6f85f4e3ba 100644
--- a/Formula/parsley.rb
+++ b/Formula/parsley.rb
@@ -12,8 +12,11 @@ class Parsley < Formula
     argp = Formula.factory("argp-standalone").prefix
 
     # remove the refs to /opt/local and use this opportunity to link to argp
-    inreplace 'configure', '-L/opt/local/lib', "-L#{argp}"
-    inreplace 'configure', '-I/opt/local/include', "-I#{argp}"
+    inrepace "configure" do |s|
+      s.gsub! '-L/opt/local/lib', "-L#{argp}"
+      s.gsub! '-I/opt/local/include', "-I#{argp}"
+    end
+
     system "./configure", "--disable-dependency-tracking", "--prefix=#{prefix}"
     system "make install"
   end