diff --git a/pkgs/development/libraries/arts/default.nix b/pkgs/development/libraries/arts/default.nix
index d4c4d45a8267..8ba75ed8c489 100644
--- a/pkgs/development/libraries/arts/default.nix
+++ b/pkgs/development/libraries/arts/default.nix
@@ -4,7 +4,7 @@ stdenv.mkDerivation {
   name = "arts-1.5.10";
 
   src = fetchurl {
-    url = mirrors://kde/stable/3.5.10/src/arts-1.5.10.tar.bz2;
+    url = mirror://kde/stable/3.5.10/src/arts-1.5.10.tar.bz2;
     sha256 = "0ffcm24lkgg3sm89q4zsj8za5h5d9j1195pmbjhx4hj0xcwkiqlj";
   };