diff --git a/pkgs/applications/science/math/calc/default.nix b/pkgs/applications/science/math/calc/default.nix
index 053426d90754..041dde8bac3c 100644
--- a/pkgs/applications/science/math/calc/default.nix
+++ b/pkgs/applications/science/math/calc/default.nix
@@ -7,8 +7,8 @@ stdenv.mkDerivation rec {
 
   src = fetchurl {
     urls = [
-      "https://github.com/lcn2/calc/releases/download/v${version}/${pname}-${version}.tar.bz2"
-      "http://www.isthe.com/chongo/src/calc/${pname}-${version}.tar.bz2"
+      "https://github.com/lcn2/calc/releases/download/v${version}/calc-${version}.tar.bz2"
+      "http://www.isthe.com/chongo/src/calc/calc-${version}.tar.bz2"
     ];
     sha256 = "sha256-bPacYnEJBdQsIP+Z8D/ODskyEcvhgAy3ra4wasYMo6A=";
   };