diff --git a/pkgs/development/interpreters/lua-5/default.nix b/pkgs/development/interpreters/lua-5/default.nix
index b7dc413b489..5e9514f11e8 100644
--- a/pkgs/development/interpreters/lua-5/default.nix
+++ b/pkgs/development/interpreters/lua-5/default.nix
@@ -1,11 +1,13 @@
-{stdenv, fetchurl, ncurses, readline}: 
+{stdenv, fetchurl, ncurses, readline}:
 
 stdenv.mkDerivation {
   name = "lua-5.1.4";
+
   src = fetchurl {
-    url = http://www.lua.org/ftp/lua-5.1.4.tar.gz;
+    url = "http://www.lua.org/ftp/lua-5.1.4.tar.gz";
     sha256 = "0fmgk100ficm1jbm4ga9xy484v4cm89wsdfckdybb9gjx8jy4f5h";
   };
+
   makeFlags = [ "CFLAGS=-fPIC" ];
   buildFlags = "linux"; # TODO: support for non-linux systems
   installFlags = "install INSTALL_TOP=\${out}";