diff --git a/pkgs/development/libraries/libpng/default.nix b/pkgs/development/libraries/libpng/default.nix
index 0a1e4c0f35dd..16fe511f1f1a 100644
--- a/pkgs/development/libraries/libpng/default.nix
+++ b/pkgs/development/libraries/libpng/default.nix
@@ -6,7 +6,7 @@ stdenv.mkDerivation rec {
   name = "libpng-1.2.46";
   
   src = fetchurl {
-    url = "mirror://sourceforge/libpng/${name}.tar.gz";
+    url = "mirror://sourceforge/libpng/${name}.tar.xz";
     sha256 = "0rcx4v4khdkrvz7b02fmx7lab2pk1lal4dhx9widv36b7g2xvwzn";
   };