diff --git a/pkgs/development/compilers/mozart/binary.nix b/pkgs/development/compilers/mozart/binary.nix
index ae040297313c..dc806d52af20 100644
--- a/pkgs/development/compilers/mozart/binary.nix
+++ b/pkgs/development/compilers/mozart/binary.nix
@@ -10,7 +10,7 @@ in stdenv.mkDerivation {
   name = "mozart-binary-${version}";
 
   src = fetchurl {
-    url = "http://sourceforge.net/projects/mozart-oz/files/v${version}-alpha.0/mozart2-${version}-alpha.0+build.4105.5c06ced-x86_64-linux.tar.gz";
+    url = "mirror://sourceforge/projects/mozart-oz/files/v${version}-alpha.0/mozart2-${version}-alpha.0+build.4105.5c06ced-x86_64-linux.tar.gz";
     sha256 = "0rsfrjimjxqbwprpzzlmydl3z3aiwg5qkb052jixdxjyad7gyh5z";
   };