1 files changed, 2 insertions, 2 deletions
diff --git a/doc/manual/expressions/builtins.xml b/doc/manual/expressions/builtins.xml
index f71a8f3be..6709c4081 100644
--- a/doc/manual/expressions/builtins.xml
+++ b/doc/manual/expressions/builtins.xml
@@ -349,7 +349,7 @@ stdenv.mkDerivation { … }
 
 <programlisting>
 with import (fetchTarball {
-  url = https://github.com/NixOS/nixpkgs-channels/archive/nixos-14.12.tar.gz;
+  url = "https://github.com/NixOS/nixpkgs-channels/archive/nixos-14.12.tar.gz";
   sha256 = "1jppksrfvbk5ypiqdz4cddxdl8z6zyzdb2srq8fcffr327ld5jj2";
 }) {};
 
@@ -1406,7 +1406,7 @@ stdenv.mkDerivation {
   ";
 
   src = fetchurl {
-    url = http://ftp.nluug.nl/pub/gnu/hello/hello-2.1.1.tar.gz;
+    url = "http://ftp.nluug.nl/pub/gnu/hello/hello-2.1.1.tar.gz";
     sha256 = "1md7jsfd8pa45z73bz1kszpp01yw6x5ljkjk2hx7wl800any6465";
   };
   inherit perl;