diff --git a/pkgs/development/libraries/libmspack/default.nix b/pkgs/development/libraries/libmspack/default.nix
index b78e583fa640..1b981edcdcd1 100644
--- a/pkgs/development/libraries/libmspack/default.nix
+++ b/pkgs/development/libraries/libmspack/default.nix
@@ -1,13 +1,10 @@
 {stdenv, fetchurl}:
 
 stdenv.mkDerivation {
-  name = "libmspack-0.4alpha";
+  name = "libmspack-0.5alpha";
   src = fetchurl {
-    # upstream url: "curl: (22) The requested URL returned error: 406 Not Acceptable"
-    #url = http://www.cabextract.org.uk/libmspack/libmspack-0.4alpha.tar.gz;
-    url = "http://pkgs.fedoraproject.org/lookaside/pkgs/libmspack/"
-      + "libmspack-0.4alpha.tar.gz/1ab10b507259993c74b4c41a88103b59/libmspack-0.4alpha.tar.gz";
-    sha256 = "0s2w5zxx9cw7445cx9ap59ky5n7r201551zg906w9ghcys1qk5dp";
+    url = "http://www.cabextract.org.uk/libmspack/libmspack-0.5alpha.tar.gz";
+    sha256 = "04413hynb7zizxnkgy9riik3612dwirkpr6fcjrnfl2za9sz4rw9";
   };
 
   meta = {
@@ -15,5 +12,4 @@ stdenv.mkDerivation {
     homepage = http://www.cabextract.org.uk/libmspack;
     license = stdenv.lib.licenses.lgpl2;
   };
-
 }