diff --git a/pkgs/development/libraries/gmp/5.1.0.nix b/pkgs/development/libraries/gmp/5.1.0.nix
index c480ea4f459..88d639e621b 100644
--- a/pkgs/development/libraries/gmp/5.1.0.nix
+++ b/pkgs/development/libraries/gmp/5.1.0.nix
@@ -4,7 +4,8 @@ stdenv.mkDerivation rec {
   name = "gmp-5.1.0";
 
   src = fetchurl {
-    url = "mirror://gnu/gmp/${name}.tar.bz2";
+    urls = [ "mirror://gnu/gmp/${name}.tar.bz2"
+      "ftp://ftp.gmplib.org/pub/${name}/${name}.tar.bz2" ];
     sha256 = "15n7xxgasbxdch8ii8z9ic6fxc2ysk3q8iavf55abjp5iylspnfz";
   };