diff --git a/Library/Formula/libtiff.rb b/Library/Formula/libtiff.rb
index 1475b3fe5d75..93d259af70b0 100644
--- a/Library/Formula/libtiff.rb
+++ b/Library/Formula/libtiff.rb
@@ -10,7 +10,7 @@ class Libtiff < Formula
   def install
     ENV.universal_binary if build.universal?
     system "./configure", "--disable-dependency-tracking",
-                          "--without-x"
+                          "--without-x",
                           "--prefix=#{prefix}"
     system "make install"
   end